Yeah, you simply cannot consume sugars in keto or you'll start putting on weight. Keto depends on maintaining a low insulin level to prevent your body from putting on weight. Eating sugars spikes your insulin, putting your body into fat storage mode. When I did keto before, they only carbs I ate after an initial no-carb period of about a month was broccoli. Because broccoli has a very low glycemic index, as it's mostly fiber, and its carbs are processed very slowly over time, unlike sugar.