It all depends on his frame or his constitution. In males the fat stores are intertwined with the muscles, meaning that he might just be losing fat from the tissue within his muscles.
I am 6'2 and 140 lbs. I work out alot and eat a vegan diet. But I have alot of muscle and very little fat. I'm also young which might contribute.=]Its genetics as well, I inherited both of my parents already streamline frame and that, paired with a healthy vegan diet and excersize. . . The charts might say that one is underweight, but its the perportions. theres people who are within a healthy weight class who have fat instead of muscle which is not healthy.
Too many fats and oils might make him gain weight but that could lead to other problems as well. Its not unhealthy to be thin, its how he feels, does he feel week? is he tired all the time or get dizzyness when he gets up or sits down? Funky blood work? If he looks gaunt in the eyes as well.
For gaining weight ,maybe afew food swaps can be made that are just higer caloric forms? sweet potatoes instead of gourds/ squash, mangoes, coconut, pears, pineapple and dates instead of apples, melons, oranges, plums, berries. Use sweet rice ,sticky rice, andbasmati instead of the grain berries, wild rice, or oats. Uhmm. . . tahini, pecans, and brazil nuts instead of almonds, pistachios, and seeds. . . and for protiens, I think useing tempeh, seitan, fava, and kidneys and mungs are good as apposed to chickpeas, small red, adukis, black beans, and cannelinni. Just keep in mind to have variety and include all fruits veggies nuts grains and legumes, but make these the more regulars because they are mroe nutrient dense.
I hope this helps anyone else who views this page. =]
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