Alternate day fasting. I do it three days a week. Eat only 200 calories for the fasting period of 24 hours. Otherwise eat smart, careful not to overindulge. It starts to activate fat burning which otherwise is dormant.
alternate day fasting - Google Scholar
There is really nothing wrong with fasting and exercise, it takes a bit to get used to but certainly do able. I still ride about 30-40 km each day while doing it.