I'm not qualified to give you official advice, but you can research and seek consultation about eating one meal daily / fasting with the Muslims all-year round, and also going into low-carb / ketogenic diet...

I'm currently eating one heavy meal daily, and I'm awaiting for year-end for a week+ break to get into a peak state of low-carb...

Anyway, best of luck, OP.

Edit: I'm exercising regularly and will only drink plain water, tea, real black coffee, or at most, latte. I do encourage that you walk and stretch more... Health is wealth btw... (But do take advice on exercising from doctors instead of reading here)

Edit Reason: More Information.