Food Engineering: What It Is, Processes, Examples and Careers

Food engineering applies engineering science, mainly heat and mass transfer, fluid flow and thermodynamics, to the design and operation of food processing: pasteurizing, freezing, evaporating, drying, extruding and packaging food. The Institute of Food Technologists (IFT) has had a Food Engineering Division since 1976; it lists 1,200+ members.

This page works with the numbers food engineers use: the legal pasteurization times for milk, the energy it takes to turn milk into powder, and the laws that require a food safety plan. Each figure links to the regulator, standard or paper it comes from, checked on 10 October 2026; our own arithmetic is labelled.

Question	Short answer
Core science	Mass and heat transfer, fluid flow, thermodynamics, and mass and energy balances (IFT 2026 guidelines)
Standard textbook	Introduction to Food Engineering, 6th edition, by R. Paul Singh, Dennis R. Heldman and Ferruh Erdogdu (Academic Press)
Professional home	IFT Food Engineering Division, founded 1976
US pay	$98,590 median for agricultural engineers, May 2025 (BLS); BLS has no separate food engineer title
Main legal duty	HACCP-based procedures (EU, UK), a written food safety plan (US), a food safety management system plan with the licence (India)

What is food engineering?

IFT’s career guide puts it in one line: “Food engineers design and develop systems for processing, storing, packaging, and handling food” (IFT). The University of Georgia describes its food engineering option as “the application of physical and engineering sciences in the design and operation of food processing facilities”. Its graduates “function in teams of food scientists” (UGA).

The engineering part is quantitative. IFT’s 2026 guidelines for approving food science degrees list food engineering as a required area. A graduate should be able to “define principles of food engineering (mass and heat transfer, fluid flow, thermodynamics)” and to “formulate mass and energy balances for a given food manufacturing process” (IFT, April 2026).

Food engineering vs food science vs food technology

Term	What it covers
Food science	“the discipline in which the engineering, biological, and physical sciences are used to study the nature of foods, the causes of deterioration, the principles underlying food processing, and the improvement of foods” (IFT)
Food technology	“the application of food science to the selection, preservation, processing, packaging, distribution, and use of safe, nutritious, and wholesome food” (IFT)
Food engineering	designing and developing “systems for processing, storing, packaging, and handling food” (IFT career guide), with the calculations behind them

IFT itself notes that “the terms food science and food technology are often used interchangeably.” Degree names vary: in India, for example, NIFTEM-Thanjavur offers a B.Tech in Food Technology and an M.Tech in Food Process Engineering (details under qualifications below).

Goals of food engineering

Five goals, each tied to a rule or a measured figure:

• Make food safe. The US milk ordinance defines pasteurization as “heating every particle of milk or milk product” to a listed temperature and holding it “for at least the corresponding specified time” in “properly designed and operated equipment” (PMO 2025).
• Make it last. Freezing “slows or even stops the growth of microorganisms”, but “only a few microorganisms are actually killed by freezing” (National Center for Home Food Preservation), so frozen food is preserved, not sterilized. Canned low-acid food must reach “commercial sterility” (21 CFR 113.3).
• Keep quality. High pressure processing is designed for “an improved retention of nutritional or sensory attributes when compared to thermally processed products” (peer-reviewed review): improved, not perfect.
• Use less energy. Removing a kilogram of water in a spray dryer takes 10 to 20 times the energy of removing it in an evaporator (Prestes et al., 2022). That is why milk is concentrated before it is dried; the worked example below puts numbers on it.
• Meet the law. Food businesses must run HACCP-based procedures in the EU and UK, and FDA-registered US facilities need a written food safety plan. See the food safety section below.

Processes and practices

The standard textbook, Introduction to Food Engineering (6th edition), is organised by unit operation: fluid flow, heat transfer, preservation processes, refrigeration, freezing, evaporation, psychrometrics, mass transfer, membrane separation, dehydration, extrusion, packaging, and cleaning and sanitation. A real plant chains several of them. Milk powder is a good example.

In the University of Guelph dairy textbook, milk for powder “is first clarified, standardized and then given a heat treatment”. That treatment “is usually more severe than that required for pasteurization”. The milk is then evaporated, spray dried and “packaged in containers able to provide protection from moisture, air, light”. Dairy evaporation “is usually done in long-tube vertical falling film evaporators” (Prestes et al.).

Heat transfer: conduction, convection and radiation

Heat moves in three ways: conduction, convection and radiation (MIT; NASA). In MIT’s wording, conduction is “transfer of heat occurring through intervening matter without bulk motion of the matter”. Convection is “heat transfer due to a flowing fluid”. Radiation is “transmission of energy through space without the necessary presence of matter”. This page used to list “induction” as a mode; that was wrong.

Pasteurization and sterilization

Pasteurization is defined in law by time and temperature pairs: every particle must reach one of the listed temperatures and stay there for at least the listed time.

Method	Minimum temperature	Minimum time
Vat (batch)	63°C (145°F)	30 minutes
HTST (continuous)	72°C (161°F)	15 seconds
HHST	89°C (191°F)	1.0 second
HHST	90°C (194°F)	0.5 seconds
HHST	94°C (201°F)	0.1 seconds
HHST	96°C (204°F)	0.05 seconds
HHST	100°C (212°F)	0.01 seconds
Ultra-pasteurized	138°C (280°F)	2 seconds

Reading the table (our calculation): raising the temperature from 72°C to 89°C cuts the required hold from 15 seconds to 1 second, a 15-fold shorter hold for 17 more degrees. Even ultra-pasteurized milk has “an extended shelf-life under refrigerated conditions” (PMO): it still goes in the fridge. Shelf-stable milk is “aseptically processed and packaged”, meaning commercially sterile “under normal non-refrigerated conditions” and regulated under 21 CFR Parts 108, 113 and 117.

For canned food, US rules (21 CFR 113.3) define low-acid foods as those with “a finished equilibrium pH greater than 4.6 and a water activity (a_w) greater than 0.85″. They must reach commercial sterility through a “scheduled process” chosen by the processor. The usual safety margin is the 12D, or botulinum, cook. The slowest-heating part of the can gets enough heat for “the equivalent of 12 successive decimal reduction times” (University of British Columbia): twelve tenfold reductions, or 10¹² (our arithmetic).

Refrigerating and Freezing

Freezing runs in three stages: cooling to the initial freezing point, “removing the latent heat of crystallization”, then cooling to storage temperature (Foods, 2021). It preserves food by lowering temperature and “tying up water so that it can’t be used”, but it kills few microorganisms (NCHFP).

Evaporation and drying

Evaporation removes water “to increase the solutes content such as proteins, fat, sugars, and minerals”. Spray drying then sprays the concentrate into hot air. The drying air enters “at 150-250 °C”, and dried particles stay in the dryer “around 5 to 30 s” (Prestes et al., 2022). The same review reports that about “90% of the water is removed in the evaporator and only 9-10% in the spray dryer”. The reason is energy, as this worked example shows.

Route for removing 100 kg of water	Energy (our calculation)
Evaporator with vapour recompression removes 90 kg (90 × 300 kJ), two-stage spray dryer removes 10 kg (10 × 4,300 kJ)	27,000 + 43,000 = 70,000 kJ
Single-effect evaporator removes 90 kg (90 × 3,200 kJ), same dryer removes 10 kg	288,000 + 43,000 = 331,000 kJ
Two-stage spray dryer removes all 100 kg (100 × 4,300 kJ)	430,000 kJ

Drying everything in the spray dryer uses about 6 times the energy of evaporating first (430,000 ÷ 70,000 = 6.1). The evaporator design matters almost as much as the order: the single-effect route uses 4.7 times the energy of the vapour recompression route (331,000 ÷ 70,000). Pressure-driven membrane filtration needs only 14 to 36 kJ per kilogram of water, but it concentrates rather than dries.

Food packaging

Packaging is engineered too. In modified atmosphere packaging, air is replaced “with a single gas or a mixture of gases”, and the usual gases are nitrogen, oxygen and carbon dioxide (Foods, 2018). Each gas has a job. Nitrogen is an inert filler that prevents “pack collapse”. Carbon dioxide slows spoilage bacteria and works best in chilled food. High oxygen keeps red meat bright red; the most common mix is 60 to 80% oxygen with 20 to 30% carbon dioxide. More on pack formats in packing department.

Food safety management systems (FSMS) and the law

GOV.UK puts the purpose plainly: “you need to have a food safety management system to make sure your food is safe to eat” (GOV.UK). What the law requires differs by country:

Where	Legal requirement
EU	A “permanent procedure or procedures based on the HACCP principles” for every food business after primary production (Regulation 852/2004, Art. 5); since 2021 also evidence of an appropriate food safety culture
UK (Great Britain)	The same Article 5 duty, kept after Brexit (legislation.gov.uk); “Your food safety management system must meet the Hazard Analysis and Critical Control Point (HACCP) principles” (GOV.UK)
United States	A written food safety plan, prepared or overseen by a “preventive controls qualified individual”, for FDA-registered facilities (21 CFR 117.126); written HACCP plans for juice (Part 120), seafood (Part 123) and meat and poultry (9 CFR 417)
India	Schedule 4 hygiene rules for licensed businesses, and a “Food Safety Management System plan or certificate” with the licence application; units under central licensing need a certificate from accredited agencies (FSSAI licensing regulations)

US very small businesses (under $1,000,000 a year in food sales, inflation-adjusted) count as “qualified facilities” with modified requirements (21 CFR 117.5; 117.3).

The HACCP principles themselves come from the Codex Alimentarius General Principles of Food Hygiene (CXC 1-1969, last revised 2022):

1. Conduct a hazard analysis and identify control measures.
2. Determine the critical control points (CCPs).
3. Establish validated critical limits.
4. Establish a system to monitor control of CCPs.
5. Establish corrective actions for when monitoring shows a deviation.
6. Validate the HACCP plan, then verify that it is working as intended.
7. Establish documentation and records.

ISO 22000 is not the law. It is a voluntary standard: a business can “seek certification or registration of its FSMS by an external organization, or make a self-assessment or self-declaration”. Its committee says it is for organisations that want more “than is normally required by law” (ISO/TC 34/SC 17). The current edition is ISO 22000:2018 with a 2024 climate amendment. A revision (ISO/DIS 22000) has finished its public ballot, and the committee has a March 2027 meeting planned to finalize the final draft (committee news, March 2026). Certification is a business choice, often driven by “export or specifications of customers” (European Commission). Schemes recognised by the Global Food Safety Initiative include BRCGS Issue 9, IFS Food version 8, SQF edition 9 and FSSC 22000 (GFSI). FSSC 22000 Version 7 was released on 1 May 2026, and Version 6 audits end on 30 April 2027 (FSSC).

Traceability rules are changing too. The US Food Traceability Rule originally applied from 20 January 2026, but Congress told FDA not to enforce it before 20 July 2028, and FDA says it will comply (Federal Register, 9 October 2026). A draft guidance the same day says FDA does not intend to enforce the rule against retail food establishments and restaurants with $250,000 to $1,000,000 in average annual food sales (FDA draft guidance). For the plant side of this, see lot tracking.

Technologies used in food engineering

Thermal processing

The heat treatments are covered above. Milk is pasteurized at 72°C for 15 seconds or another legal pair. Ultra-pasteurization at 138°C for 2 seconds gives a longer chilled shelf life. Aseptic processing and canning reach commercial sterility for shelf-stable food.

Non-thermal technologies

High pressure processing (HPP) puts packed food in a vessel at 300 to 600 MPa (Foods, 2022). Pressures of 400 to 600 MPa inactivate food-borne viruses and vegetative bacteria. But “most bacterial endospores” survive (Frontiers in Microbiology, 2015). So HPP products are “generally distributed and stored under refrigeration (<7 °C)”, which stops spores such as Clostridium botulinum from growing.

Non-thermal does not mean no nutrient loss. HPP gives “nearly fresh” products, not identical ones (Foods, 2022). Ultrasound can oxidize lipids and degrade vitamin C (Foods, 2021). In one cold plasma study, kiwifruit juice lost 9% of its vitamin C during treatment (Food Chemistry: X, 2025). This page once said no nutrients are lost; that was wrong.

Modified atmosphere packaging (gas flushing)

Gas flushing is not only nitrogen. The flush can be nitrogen, carbon dioxide, oxygen or a mix, chosen per product, as described under food packaging above.

3D food printing

3D food printing is additive manufacturing, “the process of making three-dimensional solid objects from a digital file”. Edible inks include “sugar, chocolate, and doughs” (Nutrients, 2021). Extrusion printers are cheap and flexible. Their drawbacks are “low level of printing precision and a very long build time” (Food Technology and Biotechnology, 2025). Product size, process control and material cost also limit wider use.

Biosensors

A biosensor pairs “a target recognition component such as receptors, nucleic acids, or antibodies and a signal transducer” (Biosensors, 2020). The point is speed: conventional culture tests need “up to 72 h for bacteria”, while biosensors aim to “deliver fast, on-site tracking” during production.

Milk pasteurization by microwave

Continuous microwave heating can pasteurize milk if a holding phase keeps the time and temperature (Journal of Food Protection). At high pasteurization temperatures it caused less thermal denaturation than conventional heating. We found no study showing microwaved milk tastes better than conventionally pasteurized milk, as this page once claimed. The one sensory study we found compared microwave milk with indirect UHT milk: the UHT milk was “visibly darker” with more caramelized and stale flavors (Clare et al., 2005). That is not a test against ordinary pasteurization.

For packaged food, Washington State University’s microwave sterilization process heats it in pressurized hot water with 915 MHz microwaves; WSU reports FDA approvals in October 2009 and December 2010 (WSU).

Who are food engineers?

In US labour statistics, “food engineer” is not its own occupation: the BLS A-Z index has no such title. O*NET lists “Food Engineer” as a reported job title under Food Scientists and Technologists (O*NET 19-1012), while the plant-design task “Design food processing plants and related mechanical systems” sits under Agricultural Engineers (O*NET 17-2021).

Engineers in US food manufacturing	Jobs, May 2025
All engineers	8,570
Industrial engineers	6,260
Mechanical engineers	900
Chemical engineers	110
Agricultural engineers	80
Food scientists and technologists (for comparison)	6,330

Our calculation from the table: about 73% of the engineers employed in US food manufacturing are classed as industrial engineers (6,260 of 8,570).

Responsibilities of food engineers

These duties come from the official US task lists and regulations, not from a job ad:

• Design food processing plants and related mechanical systems (O*NET 17-2021).
• Develop “new or improved ways of preserving, processing, packaging, storing, and delivering foods” (O*NET 19-1012).
• Test processing equipment “to ensure products are produced according to specifications” (O*NET 19-1012).
• Work with “process engineers, plant operators, flavor experts, and packaging and marketing specialists” to solve product development problems (O*NET 19-1012).
• Design safer equipment for food processing, one of the goals BLS names for agricultural engineers.
• Where they serve as the facility’s preventive controls qualified individual, prepare or oversee the written food safety plan (21 CFR 117.126); the Codex HACCP sequence starts by assembling a HACCP team.

Types of food engineers

O*NET’s reported titles for agricultural engineers include Agricultural Engineer, Product Engineer, Project Engineer, Field Engineer and Research Engineer; for food scientists and technologists they include Food Engineer, Food Technologist, Product Development Scientist and Food Safety Regulatory Manager. In food plants, most engineers are industrial, mechanical or chemical engineers (table above).

We previously listed “Food Scientist” as a type of food engineer. It is a related but separate occupation (O*NET 19-1012).

Skills of a food engineer

• Engineering science: mass and heat transfer, fluid flow and thermodynamics, and mass and energy balances for a whole process (IFT FE.1 and FE.2).
• Pilot plant practice: IFT expects “pilot-plant facilities used to teach principles of unit operations and food processing”.
• Mathematics and biology: ABET’s biological engineering criteria require “mathematics through differential equations, college-level chemistry and biology, advanced biological sciences”.
• Food safety systems: hazard analysis, critical limits, monitoring, validation and records (the seven HACCP principles above).

Qualifications and available courses

Country	Typical route (checked 10 October 2026)
United States	An engineering bachelor’s degree. ABET’s criteria for biological programs cover titles with “food” (ABET 2026-27); Ohio State’s Food, Biological, and Ecological Engineering degree is accredited under them (ABET). IFT approves 42 US and 52 international food science and technology programs (IFT).
India	Four-year B.Tech programs, for example NIFTEM-Kundli’s B.Tech (Food Technology and Management) has 200 seats (prospectus 2026-27); NIFTEM-Thanjavur’s B.Tech (Food Technology) has 90, through JEE Main (prospectus). M.Tech options include Food Process Engineering (NIFTEM-T); IIT Kharagpur has an Agricultural and Food Engineering Department (IIT KGP).
Philippines	Food technologists must pass a licensure exam under Republic Act 11052 (RA 11052). Since 2026 the board accepts a BS Food Engineering as equivalent to BS Food Technology (PRC resolution); in the August 2026 exam, 705 of 1,063 passed (PRC).
Europe	Examples: Wageningen’s MSc Food Technology (2 years, WUR), DTU’s MSc Eng in Food Technology (DTU), or Nottingham’s MSc Food Process Engineering (12 months, IChemE-accredited, Nottingham).

Pay and job outlook in the US

BLS reports a median annual wage of $98,590 for agricultural engineers in May 2025. The lowest 10% earned under $68,060 and the highest 10% over $166,460. Employment is projected to grow 7% from 2025 to 2035, with about 100 openings a year (BLS). Food scientists and technologists earned a median $88,720 (BLS). Because the job sits across several occupations, no single pay figure is the “food engineer” salary.

Textbooks and journals food engineers use

• Introduction to Food Engineering, 6th edition, Singh, Heldman and Erdogdu (Academic Press).
• Fundamentals of Food Process Engineering, 4th edition, Toledo, Singh and Kong (Springer, 2018).
• Food Process Engineering and Technology, 3rd edition, Zeki Berk (Academic Press, 2018).

Journal	Publisher	First volume
Journal of Food Engineering	Elsevier	1982
Journal of Food Process Engineering	Wiley	1977
International Journal of Food Engineering	De Gruyter	2005
Food Engineering Reviews	Springer	2009
Food and Bioproducts Processing	IChemE, with Elsevier	not stated
Journal of Food Science	IFT, on Wiley	1936

FAQs

Choosing a path into food engineering

If you want to design and calculate processes and plants, an engineering degree with food coursework is the direct route. In the US, ABET accredits such programs under its biological engineering criteria, and most engineers in food plants hold industrial, mechanical or chemical titles. If product development is the goal, note that BLS says food technologists “generally work in product development”; an IFT-approved food science or technology degree leads there. In the Philippines, a BS Food Engineering now qualifies for the food technologist licence exam. In India, NIFTEM offers a 4-year B.Tech in food technology and an M.Tech in food process engineering. Whichever you choose, IFT expects graduates to formulate mass and energy balances like the drying example above. Related reading: batch flow, food and beverage ERP software and quality management software.

How we researched this page

On 10 October 2026 we read the regulations and standards directly: FDA’s Pasteurized Milk Ordinance 2025, the Code of Federal Regulations, EU and UK food hygiene law, FSSAI regulations, Codex, ISO committee pages, GFSI and FSSC. For each process we used peer-reviewed reviews. For jobs and pay we used the US Bureau of Labor Statistics and O*NET, and for degrees, textbooks and journals the university and publisher pages. Every quotation was checked against the saved source text. The two infographics were redrawn from these facts. Worked numbers are marked “our calculation”.

Correction, 10 October 2026: earlier versions of this page got five things wrong. They listed “induction” as a heat transfer mode; the three modes are conduction, convection and radiation. They said non-thermal processing loses no nutrients. They said microwaved milk tastes better than conventionally pasteurized milk; we found no study showing this. They said food safety systems are required by law in only “a few countries”. And they listed a food scientist as a type of food engineer. These statements, and the matching infographic text, have been corrected.

References

1. IFT, Food Engineering Division
2. IFT, Food science careers
3. IFT, 2026 Guidelines for Initial IFT Approval of Undergraduate Programs (April 2026)
4. IFT, Undergraduate Education Standards (2001 revision)
5. University of Georgia, BS Agricultural Engineering, Food Engineering emphasis
6. Singh, Heldman and Erdogdu, Introduction to Food Engineering, 6th ed., Elsevier
7. Toledo, Singh and Kong, Fundamentals of Food Process Engineering, 4th ed., Springer 2018
8. Berk, Food Process Engineering and Technology, 3rd ed., Elsevier 2018
9. MIT, Unified Engineering notes: modes of heat transfer
10. NASA, STEMonstrations: thermal energy
11. FDA, Grade “A” Pasteurized Milk Ordinance, 2025 Revision
12. 21 CFR 131.3
13. 21 CFR 113.3
14. University of British Columbia, FNH 200 Lesson 6: the 12D concept
15. Foods 2021, Finite element method for freezing and thawing industrial food processes
16. National Center for Home Food Preservation, Freezing
17. Prestes et al. 2022, Conventional and alternative concentration processes in milk manufacturing, Food Sci. Technol.
18. Goff, Hill and Ferrer, Dairy Science and Technology eBook, University of Guelph
19. Djenane and Roncales 2018, Carbon monoxide in meat and fish packaging, Foods (MAP gases)
20. Regulation (EC) No 852/2004 (consolidated 24/03/2021)
21. European Commission notice 2022/C 355/01 on HACCP flexibility
22. legislation.gov.uk, Regulation 852/2004 Article 5
23. GOV.UK, Food safety management systems
24. 21 CFR 117.126 food safety plan
25. 21 CFR 117.5 exemptions
26. 21 CFR 120.8 juice HACCP
27. 21 CFR 123.6 seafood HACCP
28. 9 CFR 417.2 meat and poultry HACCP
29. FSSAI, Food Safety and Standards (Licensing and Registration) Regulations compendium
30. FAO/WHO, General Principles of Food Hygiene CXC 1-1969 (2023 edition)
31. ISO/TC 34/SC 17, ISO 22000 family
32. ISO/TC 34/SC 17 news, March 2026
33. GFSI, recognised certification programme owners
34. FSSC 22000 Version 7 FAQ
35. Federal Register 2026-20720 (traceability)
36. Federal Register 2026-20721 (retail enforcement policy)
37. Public Law 119-37
38. Houska et al. 2022, high pressure processing of plant foods, Foods
39. Ganzle and Liu 2015, pressure-mediated cell death in E. coli, Frontiers in Microbiology
40. Chacha et al. 2021, non-thermal food processing: pros and cons, Foods
41. Food Chemistry: X 2025, cold plasma and nutrients
42. Clare et al. 2005, microwave vs indirect UHT skim milk, J Dairy Sci
43. Lopez-Fandino et al. 1996, continuous microwave heating of milk, J Food Prot
44. Washington State University, microwave sterilization FDA approvals
45. Nutrients 2021, 3D food printing review
46. Food Technol Biotechnol 2025, 3D food printing review
47. Ali et al. 2020, biosensors for pathogenic food bacteria, Biosensors
48. BLS Occupational Outlook Handbook, Agricultural Engineers
49. BLS Occupational Outlook Handbook, Agricultural and Food Scientists
50. BLS OEWS, Food Manufacturing, May 2025
51. O*NET 19-1012.00
52. O*NET 17-2021.00
53. ABET Criteria for Accrediting Engineering Programs, 2026-2027
54. IFT-approved undergraduate programs
55. NIFTEM-Kundli admission prospectus 2026-27
56. NIFTEM-Thanjavur B.Tech prospectus 2026-27
57. IIT Kharagpur, Agricultural and Food Engineering Department
58. Republic Act No. 11052 (Philippine Food Technology Act of 2018)
59. PRC Board of Food Technology resolution, 2026
60. PRC, August 2026 exam results
61. Wageningen University, MSc Food Technology
62. DTU, MSc Food Technology
63. University of Nottingham, MSc Food Process Engineering

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