A few doctors ask us to limit soy products to small quantities but others encourage 2-3 servings of soy daily. Why?

Those who are allergic to soy! Dr Greger estimates soy allergy to be prevalent in approximately 0.05% of the population — that's an average of 5 people every 10,000. Also, Dr Klaper mentions that in his clinical experience, soy may cause joint inflammation in some people.

Dr McDougall explains that if we don't like soy or don't have access to soy, that's okay! Soy preparations and products are not 'essential'.

Low Fat is a key guideline in Mastering Diabetes program. Soy foods are yellow light foods, to be consumed sparingly, not as a daily staple.

Dr Esselstyn recommends strict low fat Whole Food Plant Based guidelines and asks us to limit soy intake due to its high fat nature. He recommends non-fat soy milk and very light tofu.

Dr Ornish recommends 1 serving of soy daily.

Dr Fuhrman recommends 2-4 servings weekly (not daily). He encourages us to eat a variety of beans, not just soy.

Dr McDougall says that soy foods are non-essential. He has concerns about the high fat nature of soy products. If we choose to consume them, he recommends up to 5% of total calories from soy, just like traditional Asian food plates with soy.

"If vegetable foods naturally high in fat and protein are used, I recommend limiting them to half of an avocado, or one to two ounces of raw nuts, or three to four ounces of soy products per day."

Dr Greger has several videos explaining the health benefits of soy. However, he proposes an Upper Limit of 3-5 servings of soy daily because soy consumption leads to increased IGF-1 levels.

Forks Over Knives categorizes soy foods like tofu, tempeh and soy milk as a Yellow Light food due to its high fat nature.

Dr Kahn says that soy foods are better than animal products. They are health promoting.

Dr Kristi Funk advocates soy due to its cancer protective nature. 2 servings daily.

Dr Nitu Bajekal advocates soy due to its health benefits for women's health and cancer: 2 "portions" daily (1 cup soy milk and 80g tofu, miso, tempeh or edamame; about twice the recommendation by Dr Kristi Funk.

Dr Klaper is a fan of soy foods. How many servings does he recommend daily? I couldn't glean that information from his articles and videos.

T Colin Campbell Center for Nutrition Studies recommends 2-3 servings of soy daily. Their main reasoning is cancer prevention.

Dr Peter Rogers is a rare WFPB doc who discourages soy for a variety of reasons.