This isn't true at all. In a fasted state, the body will use triglyceride, glycogen and fatty acid as sources as energy. In a fasted state, the human body increases HGH productions as well, which helps burn more fat and protects muscles(And sometimes builds it),What's your plan during Ramadan ? I want too maximise the gains I can get during the period but even going to the gym will be very hard because of Ramadan and considering your body is going to break down muscle for energy because of the lack of nutrients coming in your body
Only in emergency cases does the body breakdown muscle for energy. People confuse muscle shrinking with actual breakdown of muscle for energy,