Some humans naturally don't eat much, some binge massively. It's basically two inbuilt survival mechanisms: the first is for times of abundance, the second is to survive feast-and-famine environments. It's why some people stay very thin, even though they don't actively control their diets: they hit a certain number of kcals (say, 2100) and their body says "enough". The less frequently you diet, the more you can enforce this "limit". On the other hand, some people naturally overeat, as though they were breaking a fast at every meal. These people will put on weight more easily, meaning they diet more often, meaning they reaffirm the "feast or famine" behaviour, even though there is no true famine. The human body is well equipped for both feast-fast and continual feeding. What is OPTIMAL varies, but, just as almost any human can function on any diet from 99% plant to 99% meat, any human can function on fast-feast or continual small meals. Eating frequency and quantities don't matter on their own, is what I'm getting at. What matters is when you combine them:
-low frequency + small quantity = OK, but risky long-term
-low frequency + large quantity = optimal range
-high frequency + small quantity = optimal range
-high frequency + large quantity = risk of overfeeding or even toxic overload
The behaviours themselves are just natural eating patterns, regardless of WHAT it is you're eating. However, as we live in permanent abundance, it depends on your appetite whether overeating is an issue or not. I overate yesterday (tired = ridiculously hungry) but now I'm not hungry at all today. Even had to save my breakfast to finish later, which is unheard-of.
Just eat what your body wants and see if it controls itself or if you just gorge. Then, adjust accordingly.
I rarely talk to people about Paleo/Primal, but, when I do, it's when they're NOT complaining about their weight or health.
You see, I don't really "do" pity. And one thing I've learned about people is that they're more open to suggestion when they're happy and stable. When they complain they only ever want pity, not to be advised.