I am 26 years old guy 5'7 but underweight (weighing only 50Kg). I am worried about my penis girth since it is not much! erection is around 5 in. I have started gyming in order to gain more weight. My questions are: 1) Does gaining my overall body weight will also help in gaining the girth of penis? 2) What should I focus on eating, fats or carbs or proteins that can help in increasing the girth? Any specific items too? Thank you in Advance. Please help.