Anecdata, but I've found the same. I have more energy and better performance (for physical activity and cognitive activity) when I fast for the majority of the day.

Not a fan of gimmicky diets but my eating pattern seems similar to "the warrior diet", look it up if you're curious. I just think that in nature (if we were wild humans) we wouldn't have access to a huge meal right out of bed, We'd have to work hard all day to hunt and gather our food, then celebrate as a group with a food orgy around the fire.... okay I got a bit carried away :P