Skinny and want to gain weight and abs?

I just turned 13, and I am skinny. I am a guy, and I am about 80 pounds. No matter how much I eat, I don't gain weight. I gain a few in months, but still I am underweight. My ribs point out, and so does my belly. I have almost no abs, and I am, like I said, very underweight. My doctor said it is not a problem, because it is hereditary, but my mom, dad, their parents, and their grandparents never were underweight as I.How do I gain weight and abs at the same time? Can someone tell me specific exercises and foods to eat? Also I am a type of vegetarian. I can eat seafood, though.How do I gain weight and abs?

How to Count Carbohydrates to Lose Weight

Recommended Answer:

To gain weight you need to combine protein foods with starchy carbohydrates as indicated below. Good weight gaining combinations are bread, cereals, pasta, rice, potatoes or sweet potatoes combined with meat, poultry, eggs, cheese, nuts or sea food. Peanut butter sandwiches and cheese sandwiches are good weight gaining combinations. The protein in the above combinations will help to gain extra muscles.