My grandkids were ones I would have anticipated to not eat Keto. However, hard boiled eggs has been their go-to favorite. From the time she was able to eat solids, my oldest granddaughter has devoured “boilin’ eggs”. Her younger brother followed in her footsteps. In one sitting, the two of them ate 9 hard boiled eggs. I was shocked. But, they are incredibly healthy and active, with no signs of obesity.
My suggestions would include presenting eggs (or any other meat or cheese) as the only option for one meal. But making them several different ways, so they think they are getting options.
I did chaffles, and those went over very well. But, you can morph that dough into pancakes, or breadsticks with garlic and parmesan.
The keto pizza is a fabulous one too. My kids claim they don’t eat keto, but whenever they scarf down that pizza, that’s what they got!
You also might just be dealing with that particular age group, that gets fussy around meal time. Or, the little guy might not be hungry enough to eat. After 5 kids, I’ve learned how different they all are. And, how their eating patterns fluctuate. When the youngest boy was a toddler, there were days he ate like moose, and days when he’d only want milk and nibble on part of a hot dog. When the growth spurts started happening, I was glad I raised layer chickens! Eggs, bacon, toast, OJ and milk. He ate 6 eggs, 4 pieces of toast, 4 glasses of OJ, and half a pound of bacon a few times when he was 7 and 8. Maybe put some different meat options out there, too. Cut up hot dogs, sausage patties, cheese, etc. I used cookie cutters to make shapes for the kids out of slices of cheese and turkey ham. They loved black olives, too. I accidentally discovered that my kids loved smoked salmon. (Its waaaayyy too expensive to buy regularly, but my hubby had received some as a holiday gift. Made the mistake of sharing it with the two middle kids. Good grief. They turned into monsters with that! )
If he starts throwing the food, I’d just remove the food from his reach, and wait until he is calm and decides he is hungry. If he doesn’t see any other food options, he will come around. I just hid or tossed out all the things I didn’t want them to have. After all, they can’t point and scream for foods if those foods aren’t there.
As for my youngest boy now…he is almost 23.
He’s 6’1", weighs 165-175… And, he eats mostly keto - without trying. He’d rather eat eggs, or a whole slab of lake trout for a meal - not with bread or potatoes. If he’s over here, he’ll eat green beans or broccoli as a side, but not the starches. He transitioned himself over just based on his own personal tastes. I peeked in his fridge recently…the top three items? Raw fish, eggs, and ketchup. No bread, no fries, no rice or potatoes.