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Hydrogenated oil

What the research shows

Prototype

Concerning

in studies of people

2 of 2 health findings on this page · See the findings

A fat made by turning liquid oil into a solid.

It makes oils solid or semi-solid, like in margarine.

Written from Open Food Facts and English Wikipedia12

What research says

Studies in people

  • Concern

    Heart and blood sugar risk3

    In adults, hydrogenated oil and ruminant trans fats can raise heart and blood sugar risk factors, especially cholesterol.

  • Concern

    Heart and blood vessel risk4

    In people, hydrogenated oil's trans fats raise the bad-to-good cholesterol ratio, a sign of heart risk.

Study type not stated

  • Concern

    Heart health6

    Hydrogenated oil is a main source of trans fats, which raise the risk of heart disease.

How it’s made and used

  • Trans fat intake in Canada5

    Most Canadians already ate less trans fat than the recommended limit, and hydrogenated oil was not the main source for young children.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least two findings in people. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.

References

  1. 1hydrogenated oil: ingredient taxonomy entry. Open Food Facts.
  2. 2Hydrogenation. Wikipedia. Accessed September 26, 2026.
  3. 3Verneque BJF, Machado AM, de Abreu Silva L, Lopes ACS, Duarte CK. Ruminant and industrial trans-fatty acids consumption and cardiometabolic risk markers: A systematic review. Crit Rev Food Sci Nutr. 2022;62(8):2050-2060. doi:10.1080/10408398.2020.1836471
  4. 4Ascherio A. Trans fatty acids and blood lipids. Atheroscler Suppl. 2006;7(2):25-7. doi:10.1016/j.atherosclerosissup.2006.04.018
  5. 5Demonty I, Wang KC, Rondeau I, et al. Dietary intakes of trans fatty acids before the prohibition of partially hydrogenated oils in Canada. Eur J Nutr. 2024;64(1):59. doi:10.1007/s00394-024-03569-7
  6. 6Zupanič N, Hribar M, Hristov H, et al. Dietary Intake of trans Fatty Acids in the Slovenian Population. Nutrients. 2021;13(1). doi:10.3390/nu13010207