Its a myth..If you want to gain weight better to choose well balanced diet instead to these things. A balanced diet will not only increase weight but will reduce your deficiencies.There are many reason of being underweight. 1. Endocrine disturbances 2. Genetic 3. Vitamins and minerals deficiency 4. Psychological problem 5.IBS 6. Eating disorder 7. Liver dysfunction And many more See, if we know thw cause , it is very easy for you to gain weight in better way.   So my opinion is to contact directly to us so that we can find the cause of weight reduction and suggest according ly.

You need to take high protein diet. Ask me directly for customized diet plan for you