Good question Arzoo.
Dr. Wolfgang Lutz, another long standing proponent of the low carbohydrate diet, said the following:
'The low-carbohydrate program augments the anabolic processes that contribute to increased body mass in the form of bone density, muscle, and connective tissue. But the underweight person must be diligent. It takes some time to see the benefit of weight gain. Usually thin people experience a loss of weight during the first few months on the diet. This eventually gives way to increased body mass as the production of growth hormone eventually increases and the nutrients needed to build tissue ( fat and protein) are consumed. The new weight, however, will be in all the right places.'
Since I'm Type 1, I don't snack, so I can't recommend that as an approach!
All the best,
My husband is following Bernsteins's 6/12/12.
He has Impaired Glucose Tolerance, he does not use insulin.
He has gained weight by eating protein. Changing the amount of fat did nothing.
He chose a goal weight and calculated a protein goal with this formula:
his weight in kilograms * 1.5 = protein in grams divided by 6 = protein in ounces. (1 egg = 1 ounce of protein, for example).
Once he started eating that much protein or more each day, he started to gain.