Q: my son is 15 5'7" and weighs 130 would like to gain some weight tried weight gainer in powder form and he vomited over and over just on half a serving . What can I use?

A: Use real food!!! There's absolutely nothing special about weight gainer powders and in fact they are inferior to real food in helping to bulk up. They are simply whey protein mixed with simple carbs -- sugars really, even though they're usually advertised as complex carbs on a technicality. As far as your son's body is concerned they are protein + sugar. They are only popular because of their heavy marketing, not because they're better than real food in any way at all.

Instead of weight gainers your son could get much better and healthier results from eating more real food, especially protein-rich lean meats, poultry, fish, and dairy combined with complex carbs in vegetables, fruits, and whole grains.

Please check out Nutrition article to learn how to structure a good diet of real, healthy, foods for weight gain (or fat loss). If you are looking for a ready diet, something like this should be about right for your son and if he starts gaining weight too quickly, just take out one of the middle meals and spread the others more throughout the day. But again, the most important message is that best healthiest weight gains come from real, nutritious foods and not weight gainer powders.