Welcome.
It's pretty simple: eat fresh whole meat, fruit, and leafy green vegetables, and drink water. Limited amounts of tree nuts, such as walnuts or macadamias, are also okay. The meat should be full fat. Women may need to limit fruit intake for best weight loss. Eat and drink noting else - no grains, legumes, tubers, dairy, or manufactured foods.
Monitor your blood sugar levels and be prepared to reduce insulin use if you adhere to this diet strictly.