I typically just cut out sweets, fast food and snacks and increase my activity level when I want to lose weight. I also eat a salad with a good variety of vegetables before I go to bed. This is less to lose weight and more as an aid to digestion for me, because I put do put a generous amount of blue cheese dressing on it. Fresh vegetables have a plethora of healthy bacteria in them that are better for your gut than any pre-biotic that I know of and also have a lot of fiber.
Meant to say better than prebiotic or probiotic that I know of.
I forgot to say that with my salad I had desert 1 golden delicious apple.. That was all I ate one meal a day.. First 10 days hardly saw any weight loss but after that it started dropping fast. Like I said I lost 95 lbs in 3 months..