I, of course, am not a nutritionist, but still I would not advise to exclude something. A diet without sugar, without salt, without meat, without gluten, a bunch of other diets - there are plenty of them now, they are popular, but harmful.
The body needs a balanced diet. All products should be supplied: sugar, gluten, and sometimes even fatty pizza, but everything is within reasonable limits.
There are recommendations from nutritionists about the proportion of proteins, fats and carbohydrates (1: 1: 4), as well as proportion by type of food (milk, meat, flour, etc.) Recommended daily calorie content, which depends on weight. All this can be found on the Internet.
Counting calories and carbohydrates is boring, of course. But at least intuitively follow the proportions. If you don't eat much milk, add it to your diet. If you haven't eaten sweets for a long time, but want to - treat yourself to eclairs. If you are malnourished, eat up. Overeat - eat.