I've been doing Low Carb for 4 weeks. I have been very, very strict.
No alcohol.
Only drink sparkling water.
No artificial sweetener apart from a couple of low sugar jellies a week.

Week 1: -4lbs
Week 2: -4lbs
Week 3: +0.5lb
Week 4: +0.5lb

This is a typical day:
Breakfast: Coffee and single cream
Lunch: Bacon, eggs and 4 fried tomatoes
Dinner: Meat and veg (mushrooms, broccoli) sometimes cheese sauce made with mascarpone, cheese, one tsp mustard.

That's it. I feel like I can't cut back any further and there really isn't anything I'm not including.

My portions are not particularly big.

Why am I not losing weight anymore? It's very disheartening.