I dunno what you mean by fad.
We've been on for two weeks and I am, without trying to, eating about 1/3 of what I used to. Maybe 1/4. It appears that I've lost about 12 pounds.
I have yet to feel hungry. As a matter of fact, while eating between 1/3 and 1/4 of the food I used to eat I have been stuffed after every meal.
The only times M has felt hungry have been when she has to drive in to work and she hasn't been able to get enough fat content in her food. (Something we're working out with variations on recipes.)
Too soon yet for me to call it a success, but it seems to be working so far.
I used to be able to cook up and eat two boxes of Rice-A-Roni or two boxes of Kraft Mac and Cheese and add meat to it and eat the whole thing myself. Now I'm eating a piece of meat, maybe six ounces, a couple half handfuls of veggies, and maybe a cup of fruit. The veggies are usually either fried or dipped in my home made paleo baba ghanoush.
Last night was steak, sweet potato fries, (About half of a good sized sweet potato between the two of us.) fried carrots and garlic cloves. I added a few Brussels sprouts and some mustard greens for me. (M is not a fan)
We're experimenting with shish kabob baked with lard and/or coconut oil. First attempt was a hit.