I've been trying to lose weight but I have been struggling.
You are referring to the reduction of total body mass? You should try the ketogenic diet!
I am not familiar with the ketogenic diet.  What is that?
The diet forces your body to burn fats rather than carbs, which lowers your body weight.
Does that diet require me to eat certain kinds of foods and avoid some foods?
Yes you would need to limit your carbohydrate consumption, mostly fats and adequate proteins.
That sounds like it would be difficult to come up with a plan for eating since I love bread so much.
in calorific intake or exercise is called cachexia and may be a symptom of a serious medical condition. Intentional weight loss is commonly referred to as slimming.
Intentional.
Intentional weight loss is the loss of total body mass as a result of efforts to improve fitness and health, or to change appearance through slimming. Weight loss in individuals who are overweight or obese can reduce health risks, increase fitness, and may delay the onset of diabetes. It could reduce pain and increase movement in people with osteoarthritis of the knee
Ketogenic diet
The ketogenic diet is a high-fat, adequate-protein, low-carbohydrate diet that in medicine is used primarily to treat difficult-to-control (refractory) epilepsy in children. The diet forces the body to burn fats rather than carbohydrates. Normally, the carbohydrates contained in food are converted into glucose, which is then transported around the body and is particularly important in fueling brain function. However, if little carbohydrate remains in the diet, the liver converts fat into fatty acids and ketone bodies