How can I gain some extra pounds?

Earn money in Britain.

Or eat a lot in the USofA
This post was edited by JakobA the unAmerican. at October 20, 2017 5:04 PM MDT

Eat three meals per day and about one-third more at each sitting.
Make sure it's healthy food.
Have a morning and an afternoon snack of nuts, and fresh or dried fruit.
If you're doing a lot of exercise, add lots of high carbs with low glycemic index such as wholegrain rice, wholemeal bread or pasta. Have as much protein as the size of the palm of your hand.