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Beef tallow, seed oils, and full-fat dairy: Are any of them heart-healthy? - Harvard Health
health.harvard.edu/diet-and-nutrition/beef-tallow-seed-oils-and-full-fat-dairy-are-any-of-them-heart-healthy
Beef tallow, seed oils, and full-fat dairy: Are any of them heart-healthy? ...
Key FactsResearch examines beef tallow, seed oils and full-fat dairy
Jul 7, 2026 · Reading time: ~45 sec.
Summary created with AI assistance · Source: buff.ly
  • Walter Willett says beef tallow, with more than 50% saturated fat, has adverse effects, while seed oils, over 80% unsaturated, are beneficial.

  • Randomized trials associate beef tallow with higher harmful LDL cholesterol; research also indicates poorer insulin control, liver-fat accumulation, and vessel dysfunction.

  • Butter raises LDL and heart-disease risk more than plant oils, while replacing dairy fat with refined grains has unclear benefits.

  • Despite guidelines suggesting three daily dairy servings, Willett recommends about one full-fat yogurt or cheese serving, or two without meat.
  • Beef tallow (which has more than 50% saturated fat) has adverse effects, while seed oils (which contain more than 80% unsaturated fat) have beneficial effects.
    — Dr. Walter Willett, professor of epidemiology and nutrition at the Harvard T.H. Chan School of Public Health, in response to questions about heart-healthy fats.