More on the low carb thing... I know its not for everyone, and I only do it to control blood sugars - but the longer I do it, the more benefits I see.
Been eating nothing but meat and veggies for the past two weeks - that's it.
18 hour fast, woke up and rode 2.5 hours on Zwift at 180-200w with about 2800' of climbing - zero food consumed, zero energy issues. I did one mid ride pull of 5-6 min at FTP and finished the ride 3-4 min at VO2 max levels. Zero carbs consumed.
If you want to eat low carb, if eating low carb helps you fight off a disease - you can get on your bike and ride for fitness.