I am very thin. i eat a lot , but i am still thin. i want to become healthy ! how can i become healthy ?

Healthy: The best way to start is to have a complete physical by your doctor. Eat a well balanced diet. Get plenty of rest. Drink plenty of water.

Weight: First you need to seek medical care to rule out any medical reasons to cause you thin. If not, you need to increase your oral intake with high protein and high calories food. Go to gym to exercise, exercise may help you lose weight or gain weight, if exercise appropriate.