Hi Gary – Fancy seeing you around these parts.
After reading The China Study I’m pretty well convinced that there are very few chronic diseases that wouldn’t be improved by switching to a whole foods plant based diet. Eating in this way can have an anti-inflammatory effect, so it makes sense that it could help arthritis. I’ve lent out my copy of The China Study so I can’t reference it right now, but I do believe there was mention of rheumatoid arthritis in the book’s discussion of autoimmune disease.
In any case, it’s a very common misconception that vegetarian diets are somehow inherently protein deficient. Well, like any other diet it’s only protein deficient if you make it so. I eat tofu, tempeh, seitan, and a variety of beans and legumes. There’s also TVP (textured vegetable protein, great for making “meat” sauce for spaghetti, sloppy joes, taco filling, etc.) and a wide variety of “mock meats” available (usually in the freezer section of the store). Whole grains can pack a lot more protein than you’d expect. A half cup serving of barley or quinoa has about 11 g of protein. Breads made with 100% whole wheat usually have around 4 or 5 g protein/slice. Spelt flour contains even more protein and other nutrients like B vitamins, and can be good for people with gluten allergies or sensitivity.
I think the food culture of the US is very protein obsessed. IMO, and from what research I’ve read, if you’re not a body builder and rapidly putting on muscle mass or maintaining a large amount of muscle, getting anywhere from 10 – 20% (depending on the individual) of your calories from protein will likely meet your body’s needs.
There’s a lot of information out there, and if your brother likes to cook this should be a pretty easy and enjoyable transition. Just out of curiosity, did you brother’s doctor tell him to try a vegetarian diet, or did he get the idea from elsewhere? In any case, I wish him luck and hope his arthritis improves soon!