I started intermittent fasting recently, which is suiting me, but it has cut my calorie intake even lower - sometimes as little as 600 calories a day. I must be burning fat for energy because although I get hungry towards mealtimes, I'm not feeling any ill-effects. I feel better on these lower calories, particularly with skipping breakfast.

I'm probably not getting enough protein (according to some calculations I should be eating around 75g of protein daily, but my intake is more like 40g, and today it's only been about 30g. I just worry about losing muscle and all that stuff. I listened to Jason Fung explaining that in weightloss, it's not a big deal to eat less protein as the body will consume excess skin, etc., rather than target important muscle. I have excess skin, and I'll hopefully also have excess fat cells I'll be glad to relinquish. :P

Could anyone with a bit more knowledge and experience advise me?