A summary of videos by Dr Greger on Nutritional Yeast. It fortifies our immune system, helping us prevent common infections like common cold. It also seems promising against cancer prevention. However, those with autoimmune conditions like Crohn's should avoid yeast; there is evidence that those suffering from Hidradenitis Suppurativa (HS) may also benefit by yeast removal.

Nutritional yeast has been shown to boost the immune system of three populations: (a) children, (b) adults under physical stress (athletes, for example), and (c) adults under psychological stress. A robust immune system reduces the incidence and severity of infections like common cold.

Dr Greger's videos explain that those with autoimmune conditions like Crohn's should not consume anything with yeast (nutritional yeast powder, bread, etc.) — even tiny amounts of yeast (a pinch / 15mg) may be sufficient to induce negative reactions. Those with Hidradenitis Supporativa (HS) also report benefits with yeast elimination from their diet.

Nutritional yeast seems promising for cancer prevention. Further studies are needed.

Dr Greger summarizes studies showing reduction in blood sugar levels with intake of Brewer's yeast daily, within a few weeks.

Jeff Novick expresses two concerns with nutritional yeast: (a) high calorie density, and (b) IGF-1 levels.