I have the opposite view. Eat food, entirely beef, as much as you'd like.
That is a very good way to eat thousands of calories per day in excess of base metabolic need, which for nearly everyone will result in significant weight gain.
What actually happens is that you get satiated a LOT faster because beef is so nutrient dense, so you end up eating fewer calories and most people only eat two meals a day because they just stay satiated for so long. You also never experience the drowsiness that normally comes after eating.
This is a zero carb diet which is high in protein, so you'll find yourself effortlessly putting on muscle and losing belly fat.
When I say "entirely beef", that means "you can't put anything in your mouth that is not literally part of a cow" -- so that means no junk food, no sugar, no alcohol, not calories through drinking anything. It is the ultimate elimination diet because it is nutritionally complete yet ridiculously simple.
People call it "the lion diet" and if you actually try it you'll end up in phenomenal shape and you'll feel like you're running on jet fuel.
I have to ask, where are you getting your fibre, vitamins and minerals from?
Please tell me you're at least taking a multivitamin.
As for vitamins and minerals, beef has 100% of everything you need, especially if you eat all parts of the animal (liver, etc). Fresh beef even contains vitamin C.
This is the diet our ancestors ate for hundreds of thousands of years. We were hunters, not gatherers.