About a year-&-a-half ago, my husband decided to go on a fat-free diet.  His father died of heart-related problems while in his early 60s, as well as other family members having similar health issues.  He never went to see a doctor to have his health evaluated, so he took it upon himself to eat this way so he'll live longer than his father.  It's not just a diet, it's become a lifestyle.  Although I give him credit for taking his health into his own hands & it takes a lot of willpower to eat the way he does since his diet is extremely restrictive, I don't know if this is completely healthy.  The only foods he eats are beans, vegetables, fruits, oatmeal, & a small amount of brown rice, whole-wheat pasta, whole-wheat pancakes, & a limited amount of dried fruits.  He eats no butter, oil, dairy (not even the fat-free products), nuts, foods containing processed sugar, fish, lean meat, poultry, avocados, or olives.  Some of these off-limit foods even contain the good fats, but he still won't touch them, even in moderation.  And certain types of seafood even have no fat, but because of the cholesterol he won't eat them.  The only fat he gets is from the trace amounts found in some of the foods he eats.  He says he feels better & has more energy eating this way, & has naturally dropped a lot of weight, although that wasn't his intention for going on this diet since he never had a weight problem to begin with.  I also notice with the way he eats that it's almost as if his whole life revolves around his way of eating & he has become somewhat of a health-food control-freak.  His appearance is extremely thin & I see some changes in his personality.  I don't know if this diet has brought on these personality changes or it's just a coincidence.  I know that a lack of fat can cause the hair & nails to become dry & brittle, but can it have a negative effect on the brain, as well?