For many people gaining weight has been a frustrating and futile quest. All too often they are unaware of what is really happening within their body. To gain weight you must absorb the muscle developing and life giving nutritients especially the proteins and carbohydrates. For your body to maximise the benefits from what you are eating the villi must be clear and healthy.
Malabsorption is often due to smoking, alcohol, medications, drugs and very often stress.
Extreme cases of reduced weight can be as a result of eating disorders .