I'm 16 years now & I'm very skinny. How can I gain weight ?

There could be several causes of bringing skinny or underweight. Some of them are genetics problems, metabolism, drug use, physical or mental illness, poor eating habits, fast metabolism system, poor lifestyle, overwork or stress, etc.
Here are some home remedies to gain weight,

• Milk & Banana - Bananas are full of carbohydrates & potassium that give you instant energy. If you want to gain weight then you should eat a banana daily in the morning with a glass of warm milk.
• Potatoes - Potatoes contain significant amounts of fiber which helps. Fiber helps lower the total amount of cholesterol in the blood, & also decreasing the risk of heart disease.
• Increase Protein Intake - Protein is the building block, and your body is going to be starving for it if you don't add enough proteins to your diet. Some good sources of protein are Milk, Cheese, Eggs, Beans, Seafood, Pulses, etc.

• Daily Exercises - Exercise is essential in building muscles which also aids weight gain efforts. If you can't lift weights, then try light exercises like long walking, can' walk? try yoga then.
• Eat more - Giving more calories to your body will directly help to gain weight.