Eat and eat often. While everyone should abide by this rule, it is especially true for those who are trying to gain weight. Eating often means eating five to six small meals a day and packing in those nutrients.
    This doesn't mean eating junk food and sugars, it means lots of protein and carbs. 
        
                    
             
        
        
        
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The significance in thickness between the two is due to the different amount of pressure exerted on the walls of the heart. The left ventricle has a thicker wall because the blood must be pumped throughout the entire body (oxygenated blood), unlike the right ventricle, where blood is pumped simply to the lungs to be oxygenated (pulmonary system).
        
             
        
        
        
 C. Dehydration
If the body loses water, then it obviously needs more.