You're working against millions of years of evolution.
If a cave man is given the options of 4 foods, the cave man who eats the most calorifically dense food is more likely to live and have energy through the next lean time than the cave man who eats the leaves. It sucks but that's just how we're evolved and it's shockingly hard to "trick" those sense with fake sugar etc.
I'm sure you know this, but today one must learn to make smart choices in the face of modern foods which are readily available. I refrain from sugar in my diet and to me citric acid (Vitamin C powder) and sometimes vinegar hot sauce taste sweet.
Fruit, a rare treat, tastes like candy.
It depends on what you've become accustomed to eating.
Many hot peppers actually have a good bit of sugar in them. I was making some Tabasco sauce I'm the fall and the bees were very interested in it. I also grew some cayenne peppers that didn't have any heat and they were quite sweet.
