Sinclair calls oat milk 'sugar water'

David Sinclair is a Harvard Medical School professor and longevity researcher whose recent social‑media post on milk and glucose set off the debate. (en.wikipedia.org) Nutritionists, influencers and fact‑checkers pushed back, citing continuous‑glucose‑monitor (CGM) data and brand nutrition labels in their rebuttals. (politifact.com) Published CGM anecdotes showed varied responses: one writer’s glucose reportedly rose to about 123 mg/dL after an oat‑milk coffee, and another tester recorded roughly a 40‑point jump after an oat‑milk latte. (msn.com) Experts point to the sugars produced during oat‑milk processing — notably maltose — and a comparatively high glycemic index reported for many oat‑milk products, which can explain rapid post‑drink glucose rises even when total sugar is modest. (politifact.com) By contrast, cow’s milk contains more protein and fat per cup (about 8 g protein), macronutrients that clinical sources say tend to blunt post‑meal glucose spikes relative to high‑carb, low‑protein beverages. (health.clevelandclinic.org) Nutrition analyses show label variation — Oatly’s original lists about 7 g sugar per 8‑oz serving while some commercial oat milks deliver roughly 12–16 g total carbs per cup — and those differences track with different CGM responses. (politifact.com) Glucose‑monitoring services and dietitians recommend individual testing with a CGM, pairing oat‑based drinks with protein or healthy fats, or choosing lower‑carb unsweetened milks when the goal is to limit post‑coffee glucose spikes. (nutrisense.io)