If this is your purpose, why not eat a ketogenic diet, one high in fat, oil, and protein, and very low in sugar and starch, so your body switches from glycolysis to ketosis? Weight loss will be natural, and health should improve. Since you don't get much joy from eating, switching to a ketogenic diet should be easy for you. Don't forget to take vitamins and other needed supplements. And don't forget good rest and exercise, too.
This is not a good forum to discuss off-topic issues. Just search the web for ketosis and learn about it yourself.