You should consult with your doctor before going down this path for sure. In a nutshell, a diet that is very low in sugars and carbohydrates will cause you to go into a state of nutritional ketosis. I strive to consume less than a teaspoon worth of sugar in the morning before my midday meal (4g of carbohydrate is roughly equivalent to a teaspoon of sugar) and then throughout the rest of the day I just try to minimize my carbohydrate and sugar intake. I would strongly encourage you to seek out the advice of a qualified medical professional like a bariatric specialist. Nutritional ketosis diets are not necessarily safe for everyone so definitely consult your doctor first.

Research Ketogenic way of eating. Studies have been done at Duke University.

Look up: Stephen Phinney, MD, PhD – Inflammation, Nutritional Ketosis, and Metabolic Syndrome & Dr. Paul Mason videos.