low carb food list

So what are the reasons why these people can't gain mass? Well, yes, they do typically have a higher metabolic rate than the average person. However, it's not to the degree where they can't gain weight on a 4,000 calorie diet. The other part of the equation is that they simply can't eat enough food. Sure, they try, but their appetites can only extend so far. Now this is frustrating to me, as I can easily eat a large amount of calories. However, I realize there are less fortunate individuals out there.