**does vegan protein cause weight gain?**?

Nails like you describe are indicative of vitamin deficiency. One of the likely vitamins (among others calcium is another) is Vitamin D. I had a co-worker got the crescent red moods and she had a severe D deficiency per her doctor The have tests the doctor can do to check for deficiencies. Before you make your appointment you should ask first about over the phone to make the doctor you're seeing is familiar with it and then if not ask for recommendations. A Homeopathic doctor may be more sensitive to your needs. You need to also find out how much protein some your size and needs and if you become more active how much more you'll need. Weight gain is caused by eating more calories and fat than you burn so be aware of the ideal amount you should consume for your weight and height.