Keto diet ?

It's the most popular low carb diet, at present. This link has some basic info on it https://www.healthline.com/nutrition/ketogenic-diet-101#types and this link gives info on whether or not it's healthy/safe, and why https://www.healthline.com/health-news/keto-diet-is-gaining-popularity-but-is-it-safe-121914#1

Google will help you understand more but you cant eat some foods and have to control what you are eating to lose weight. However, its one of those diets that if you stop it, you will pile the weight back on again. 

It's more of a lifestyle change