I went on a strict Keto diet that helped me lose 20 lbs! It was hard! But it did pay off... I stuck to veggies, mostly greens cauliflower broccoli, I rediscovered V8 juice! I tried hard to stay away from bread and sugars... I did eggs, bacon, chicken, pork, even imitation crab...
The whole thing was great, until I slowly reverted to my old ways, however, because of all the weight I lost, my stomach shrank and my food portions are now not as heavy as they once were...
I am still determined to stick to keto as much as I can, but I do not think I am in ketosis anymore...
Exercise is important also in maintaining, even just walking, brisk walking, or, if you can, jogging...

Good luck with it.

Oh yeah, fast food without the buns or taco shells work well and reasonably priced meals