The answer is somewhat simple, you need to eat more. 4-6 meals a day. Mix of carbs-fat-protein at 40-30-30. Start gradually. Track your food intake using one of the online calories counters for a couple of weeks. Then increase your calories by 150-200 at a time and see where that gets you. At your height, you could easily be eating 2500-3000 calories a day depending on your workout regime.
Read through the boards. Lots of good advice and suggested reading. Good luck.
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