One of my triggers to follow a paleo principle was the 'hunger shakes'. I'd be cramming toast, fruit and nuts in to my mouth as I cooked the evening meal. 'Paleo' put paid to all that. Soon I was able to skip meals. No shakes, nothing. Something had changed within me. And yet at all times prior to going paleo I was lean an reasonably muscular.
I'd be tempted to say that fasting is an important part of being lean. Allowing hormonal patterns and various metabolic activities to exploit their full range of variability - prompting us to 'go hunt'. But the ability to fast came AFTER removal of the three horsemen (or possibly the reintroduction of meat and animal fat).
Everyone must be aware of the recent dramatic events in the paleosphere (Perfect Health Diet also has a great contribution).Everyone seems to be holding a piece of the jigsaw, but the overall picture is far from clear.
But the biggest problem for the rest of us is which way do we go? We cannot wait for science to direct us, we need to make decisions NOW. We want to do no harm.
Me? I am keeping it 'black box'. Eat and live close to the ground. Follow your paleo compass. Halve your plate, fill half with meat and half with veg. Emphasise seasonal elements. Go hungry then eat until full. KISS.