If you're having this much of an issue with food intake, it seems to me that a trip to (at the very least) a dietician might be in order.
I've been on the 16:8 intermittent fasting for just over a month now, so I have around 2 dozen rides done completely fasted (between 12-14 hours since last meal) and I think I'm down (on average) about 5% in power. I have to limit duration to ~100 minutes, but I can seemingly go as hard as I feel like, as I've had a couple of rides with averages ~230W. But I can eat most anything (excluding the laundry list of foods diverticulitis took from me.)
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