Weight gain, the concept is pretty simple. If you take more calories in from your food than your body uses you will gain weight.
And while most people finding gaining weight not all that difficult, most of the time, the weight gained is unhealthy and leads to increased health problems.
If you would prefer to gain healthy weight as opposed to just increasing your body fat percentage follow these simple steps.
Infographic Source: http://healthyfitsmart.com/how-to-gain-weight-naturally/