Research
Hormonal
Industrial trans fats are harmful and should be avoided, while natural trans fats (from ruminants) are beneficial and may protect against heart disease.
Avoid processed foods with 'partially hydrogenated oils' (industrial trans fats). However, do not avoid natural trans fats found in butter and meat from grass-fed animals, as they may actually protect your heart.
GoodQualifiesHIGH confidence
While trans fatty acids have a linear configuration, cis fatty acids have a kink... Manmade trans fats... are cheaper than animal fats with similar physical but different biological properties. These advantages in their industrial use have been acquired at the price of considerable health hazards [71]...
Why this rating
Supported by meta-analyses showing increased mortality for industrial trans fats and studies showing benefits for natural trans fats.
Source
Fatty acids: facts vs. fiction
Reinhard Waehler · International Journal for Vitamin and Nutrition Research · 2021
DOI 10.1024/0300-9831/a000713
narrative_reviewCited 14×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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