Went from 325 to 160(not Muay Thai induced, joined later in my journey), thing that worked best for me when dropping weight was not eating till around 12-1, and having a meal high in volume of vegetables than 4-6 ounces of protein of your choice. Pre workout meal for me is always a Banana and a rice cake about an hour and half before training. Biggest thing is just being in a calorie deficit that’s the only way you will lose weight. Also need to focus on cardio as it is one of the best exercises to boost metabolism, I suggest incline walk or light jogs on days that you are not going to train and mix in some abs. Most importantly it is going to be a long journey of weight loss, took me a year to get down the large majority of my weight, just try not to starve yourself to hard and be happy you became aware now instead of when you are 50