Dear Doctor Sir/ Madam I am diabetic but under strict control through medicines diet and exercise. I am 75 years old 5ft 10 inches tall but weigh only 60 Kgs and look very lean. How do I gain at least 5 Kgs extra to look fitter. I walk 4-5 kms daily rain or shine. I am a strict vegetarian. I don't smoke and no bad habits. Occasionally a social drinker in limits. I sleep well for at least 7 hits most of the days.