The Evolutionary diet is designed on the basis of ketogenic/anabolic diet minimums with a bodyopus-style refeed. As a result, when you're in a ketogenic state, meal frequency becomes mostly irrelevant due to ketones and FFA taking over as your main source of energy. In addition, ketones are protein sparing, and ketosis, in general, kills your appetite. There are studies linking high levels of ketones to high levels of leptin and low levels of ghrelin.
In terms of meal frequency, the topic is subjective at best. While there are studies showing bigger meals with less frequency lead to better fat loss, it doesn't mean you need to eat big meals if that's something you're uncomfortable with. If you want to succeed in your diet, follow the ratios and the diet theory, but, ultimately, feel what's right for you.
Study:
http://www.diabetologia-journal.org/files/Kahleova.pdf
Research material:
http://www.evolutionary.org/the-evolutionary-diet
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