My 2 cents (works for me)
Most diets recommend to much or to little of some food types. Too much suger, fat, proteines etc can be hard on the body.
Low Kalorie diets are starvation and that is tourture.
Better food reduce body fat.
Training shape the body.
Both are needed to get healthier.
The major problem is to change habits.
Allow change to take time.
A balanced diet with a lot of vegetables, fruit, nuts, seeds and some smaller portions of fish and meet will make you healty and not have to feel hungry all the time.
Drink only regular water, tee and some coffe.
Stay away from resturang and prefab food.
Best luck