ZOE Science & Nutrition Recap: Fat: The full story | Sarah Berry
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Jan 27, 2026 
Sarah Berry, professor of nutrition science who studies dietary fats, breaks down how types of fat, food matrices and processing shape health. Short takes on why saturated fats and refined carbs raise blood lipids. Notes on how cheese differs from butter and why food labels can be misleading.
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Host's Personal Diet Shift
- Jonathan Wolf changed his diet after ZOE tests and now eats more fat because his blood sugar control was worse than his blood fat control.
- He still feels guilty about foods like cheese despite seeing improved hunger control on higher-fat meals.
Dietary Cholesterol vs Fat Type
- Dietary cholesterol barely raises circulating cholesterol; type of fat matters far more for blood cholesterol levels.
- Some saturated fatty acids raise bad cholesterol while others affect good cholesterol differently, so effects vary by fatty acid type.
Carbs Also Raise Blood Lipids
- Saturated fats in foods like butter and palm oil tend to raise bad cholesterol and triglycerides.
- High refined-carbohydrate diets also raise liver-produced lipids and circulating triglycerides, increasing cardiovascular risk.