“What type of diet is recommended for obesity?”

There are a variety of diets that can help with weight loss. That being said, some are healthier than others and some will help manage cravings while in a caloric deficit better than others. A variety of studies show that vegan/plant-based diets have an edge over popular fad diets. Fad diets may help you lose weight quickly but do so at the expense of your long-term general health and mental health. Being high in fiber and antioxidants, a vegan/plant-based diet helps prevent long-term disease like diabetes, cardiovascular disease, cancer, and digestive issues that fad dieters often get later in life. The high fiber intake of a vegan/plant-based diet is also helpful for sustaining a healthy gut microbiome.
All that being said, diets that promise quick weight loss are typically more hype than reality. Studies show that those who jump from one diet to another often risk gaining more weight back than they started off with. Sustainable weight loss requires more than just changing food habits. Other aspects of health such as quality sleep, physical activity, rest/restoration, play, and mental health play important roles in both losing weights and keeping it off.