I basically do have some sugar - dry wine contains it, as do berries. But I don't eat anything with sugar in: no bread, cake, biscuits, chocolate, sodas, fruit or juices other than a few fresh berries. I don't eat pasta, rice, oats, potatoes....
What I do eat: fish, meat, shellfish, eggs, cheese, full fat natural Greek yog, sour cream, cream, creme fraiche, nuts, heaps of salad, green leafy veg, broccoli, cabbage, squash, courgette, tomatoes, peppers, sweet potato, green beans. Spices, seasoning, fresh herbs, lime/lemon juice...
Basically low carb. Under 60g a day when losing, under 90g carb a day maintaining.
Typical day: omelette, handful almonds, big ass feta and avocado salad with olives and grape tomatoes, chicken thighs with coconut milk and spice with steamed pak choi/ lamb chops with spinach and sweet potato/ baked ribs with buttered cabbage noodles/ steak and guacamole/ fish with kale and broccoli in lemon butter and flaked almonds/ sausage and tomato and aubergibe ratatouille/ shrimp with Cajun salsa and green salad, bacon cheeseburger salad no bun, few sweet potato fries...yogurt and strawberries with spoonful of cream if hormonal.
Works great for me but we are all different.
Before I was toast/ sandwich/pasta and had huge belly and crap skin and low energy.
This way feels decadent, balances my moods/skin/energy and I still get to drink and eat out. We all find our own way :) good luck.