Same happens to me... but after a couple of hours endured, blood sugar is forced to pick up. After 14 hours of not eating, your body starts burning about 70% bodyfat and 30% muscle/other for fuel exclusively. Eating one big meal a day could kill some people (blood sugar rush, rapid escalation in blood pressure and the problems that could cause), and there are many variants of intermittent fasting - Main point is, you'll lose weight far more easily by eating less, than by doing more. In my experience.
I lost two pounds a week consistently through intermittent fasting 5 days a week. Couple of months later, first stone was lost. The returns diminish as you approach your ideal weight.
Best to chat to your doc before starting any diet.
Yep, agree with all that. Dont have a problem losing weight. Can easily lose half a kg per day, when I so chose. Now I, m back in Rhythm plan is to get down to 100kg, as much as for windsurfing as health. (I, m 103 at moment) Surprising how a few kg affects how quickly board get going.
My sailing is a great test of my endurance. Even in AF I got it back to a couple of hours from 15 mins or so initially. No way on earth I could get it over 30 mins after fasting/losing weight. Also, with sailing at sea it's essential you keep something in reserve for getting home when things go wrong.
We all know our own bodies.
Surgeon suggested I get down to 95kg,I explained what I could do whilst in (quite severe) AF. (at time sail for 90 mins, emtb 25 miles,) showed him all my track logs for both sports. He was amazed and couldn't believe how much effort I could put in. (I was getting upto 3rd in overall emtb standings even in AF, and my AF is permanent, not paroxysmal or persistent)
He then said ignore me. Do exactly what you are doing. Its quite incredible with your AF and doing you more good than losing a few kg.??? Each to his own.
Nowadays we are all programmed into this eat less to be healthy band wagon. If folk want to perform in any sport to a decent standard that ethos doesn't work. If on top of trying to keep involved in your sport you develop some condition (ie AF) then weakening yourself with dieting and fasting is just not going to help. It's actually going to make things worse. To sail for 3 hours or so body needs all sustanence it can get. In AF that fueling becomes more important not less.
And your statement of performing on metabolism of fat very much depends on the activity. Fat metabolism is very slow and can not supply energy to sustain anything like hard work. If you attempt to do so, result will be quick fatigue and lactic acid production and the start of your body being literally exhausted.