A total of 1 review of this product on Reddit.
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Can he ensure he’s only eating brown rice instead of white rice and potatoes with the peels intact?
Theres a documentary on fruitarians who monoeat bananas for months on end, and they’re not obese (not saying i think this is healthy or a smart idea for anyone). It really just comes down to fiber and calories.
My husband has this book and really enjoyed it to increase his muscle mass and reduce body fat.
https://www.amazon.com/Vegan-Bodybuilding-Fitness-Robert-Cheeke/dp/0984391606/
I’d also like to add, thanks for not trying to enforce your dietary beliefs on him, and instead trying to work with it. You sound like a great friend!
Edit to add: I can’t really think of any sites aside from ones about athletes. Maybe try checking out https://www.nomeatathlete.com/
