[AZK]

easiest way to get more calories for you skinny people is to start drinking non-water beverages. This does not mean sugar.

If you are into dairy, start drinking milk...as much as you can tolerate, start drinking things in liquid form, as it's easier to get down and your body doesn't distinguish by nutritional content, only volume... i.e. one piece of bread = 1 head of lettuce, but which will make you feel more full?

Shakes like 2 scoops whey, 16oz milk, severeal tbsp of some type of nut butter, you will be in caloric excess in no time.

Other healthy alternative is drinking a TBSP of olive oil at every meal, or before and after. Try it out.