When suffering from chronic digestive issues, I've found that well-cooked starches, like white rice, potatoes, and oats, are better tolerated than simple sugars—and by well-cooked I do mean boiled for thirty minutes and mushy, but that's what digests easiest. I've never had a single issue with eating white rice boiled in bone broth; no matter my state of health, I can always digest it just fine.
Also, while I have tried eating only fruit for my carb source, I've found that it causes some lower-bowel discomfort and never fully satiates.
But the true slave diet, since we're on this topic, is one where you daily ingest chemically-contaminated, highly-processed, PUFA-laden, poison-laced food, with neither the will nor the knowledge to eat something that actually promotes, and not destroys, your health. Moreover, it's the lack of courage to comply with that health-promoting diet, especially when others may view it as unorthodox.
And, I should emphasize, to blindly follow any diet, be it one based on Ray Peat's work or another doctor's, without regular reflection and adjustment based on your body and health, is itself a form of slavishness!