What it does in the body
- No beneficial physiological function (industrial trans fats)
- Natural ruminant trans fats (CLA) may have minor anticancer and body composition effects
- Historical industrial use: extended shelf life and improved texture of processed foods
How much you need (Daily Value)
| Group | Recommended | Source |
|---|---|---|
| Adult male | <2.2g/day (<1% of calories); ideally 0g industrial trans fat | WHO |
| Adult female | <2.2g/day; ideally 0g industrial trans fat | WHO |
| Pregnancy | Zero industrial trans fat; trans fats cross placenta and impair fetal development | WHO |
| Children | Zero industrial trans fat | WHO/AHA |
| Older adults | Zero industrial trans fat; highest CVD risk population | WHO/AHA |
Richest food sources
| Food | Amount | Where |
|---|---|---|
| Partially hydrogenated vegetable oil (vanaspati/dalda) | 15-45g per 100g | south-asia |
| Commercial shortening | 10-30g per 100g | global |
| Margarine (hard stick, pre-reform) | 5-25g per 100g | north-america |
| Fried fast food (pre-ban) | 5-10g per serving | global |
| Commercial baked goods (pre-ban) | 2-8g per serving | global |
| Butter (natural ruminant TFA) | 2-5g per 100g (mostly CLA) | global |
| Cheese (natural ruminant TFA) | 1-3g per 100g | global |
If you don't get enough
Mild: Not applicable — trans fats are not needed and have no deficiency state
Moderate: Not applicable
Severe: Not applicable
Time to onset: Not applicable — zero intake is optimal
Too much
Upper limit: WHO recommends <1% of total energy intake (<2.2g/day); ideally zero industrial trans fat intake
Elevated LDL, reduced HDL, increased Lp(a), systemic inflammation, endothelial dysfunction, increased CVD risk, increased type 2 diabetes risk, potential increased cancer risk
How well you absorb it
95-100% absorbed like other dietary fats; trans configuration does not impair absorption (making them harmful — fully absorbed but metabolically disruptive)
Helped by: Standard fat digestion factors
Hindered by: Plant sterols can partially mitigate cholesterol effects but do not prevent trans fat incorporation into membranes
Cooking & storage
Industrial trans fats were created specifically for cooking stability and long shelf life. Repeated deep-frying of oils at high temperatures generates trans fats even from initially trans-fat-free oils. Home frying at moderate temperatures with fresh oil has minimal trans fat formation.
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