When you lose the fight and decide to go for some sugar/fiber just once, don't eat chocolate. It is poison.

Instead, mix yourself something of these:

Erythritol

Stevia

Natural honey

Tallow

Salt

Butter

Sour cream

Cheese

Coconut oil

Ground coffee or instant coffee

Better not, but if you have to: rice, wheat, coconut, rye, corn, barley flour.