So fun fact, I was reading literature on this last week. The data shows that rapid weight loss can have a negative impact on performance, especially if you're trying to cut more than 5% of your body weight in 2 weeks or less. If you are doing rapid weight loss, increasing training with liquid restrictions has the least impact on performance as long as you have more than an hour, ideally more than 3 hours, between weigh in and your match. Then you need to carb load and hydrate with about 1.5L for every Kg lost. The ideal way is portion control and trying to aim for about 1-2 Kg per week. As it pertains to diet trends and performance, most of the hot diets right now will negatively impact performance, i.e. keto, carnivore, paleo, gluten free.... However, one dietary pattern that did show promising data that improved performance was the Mediterranean diet, which showed subjective improvement with muai thai athletes. Here is the NASM guidelines for planning a weight loss plan as it pertains to finding your target weight goal. https://www.nasm.org/resources/calorie-calculator#:~:text=Men:%20(10%20%C3%97%20weight%20in,%C3%97%20age%20in%20years)%20%2D%20161 A quick formula for the same thing would be target weight x 12-13 = daily calories total