More meet, fish and vegetables, less carbohydrates. Eat only 2-3 times per day. No fruits between breakfast and lunch or between dinner and lunch. No sugar at all, no sweets at all, no cookies at all. More cruciferous if you can. I like to fry cauliflower and zucchini with meet and making a salad. Its better to eat fruit only with breakfast, may be after dinner. Dont drink sweet water, especially between eating. Sweet water is evil. Dont forget about eating fats - eggs, avokado, butter. Overall check your sugar in blood.
Its a normal food culture that will help you to make you healthier and lose weight. And its fun and tasty because you can eat meet dishes. I'm eating meet with salad on dinner. And my breakfast is oatmeal with fruits, berries and nut paste(its a good fat too). If I need lunch, I can eat soup, eggs, vegetables, im trying to eat 2 times per day, but um not gonna be crazy if Im eating three times.
Don't forget - very important thing is to eat 2-3 times only(2 times is better), no snacks, no sugar, no sweet water, !eat fats!.
And try to do cardio and some physical stuff. If you have a back problems, you can start with stretching, lite yoga, massages and exercises with your weight like push ups. It's better to play some sport you like, because it's more fun. And don't rush yourself from the beginning. Step by step.