I too have been underweight for the last 6 years. The result of dealing with severe stress and eating a high protein diet low carb
I changed my diet to be more balanced but still didn't gain weight. It wasn't until I started using the moreless alkaline drink that I started to see a healthy increase. I highly sugguest that you read up on the moreless ph fourum on this site and feel confident in saying that you will notice health benefits.
If you do have a malabsorption problem this drink will help.