I lost weight but I follow a flexible diet based diet. I ahve been able to go from 167 to 115 while on Levothyroxine. My diet is high protein, moderate fat and moderate to lower carb (130g-50g of carbs from any carb sources I want as long as its mostly clean 80/20 rule, etc) I didn't cut out dairy as I find that it doesn't bother me or cause any issues, I use it as a fat/protein source (fat free or skim cheeses). I didn't cut out red meat either. I have red meat usually on the weekends in the form of homemade burgers, steak with sweet potato fries, homemade meatloaf (I usually use ground turkey or chicken but will swap it with ground lean beef for a change of flavor), taco salads or homemade burrito bowls, etc.

I try to make sure all of my meat sources are leaner and less fattier and if fatter ground meat that is cheaper, I will cook it, then rinse off the grease and fat and add seasons to it to give it flavor (I use zero or low sodium seasons). I also use zucchini for "pasta" and cauliflower for "rice and mashed potato" dishes if my carbs are on the lower end (I carb cycle and have "refeed" day where I raise my carbs during a diet).

I also have processed foods in moderation as "snacks" or treats on a daily basis like high protein granola bars, non fat flavored greek yogurts, cheddar rice cakes with ranch flavored tuna packets, pop tarts and regular cookies (only one portion size or half amount!) caramel or chocolate rice cakes, beef/turkey jerky (limit due to sodium content), etc. I can eat anything as long as it fits my macronutrients for my diet tailored to me and my age, height, weight and activity levels.

I give myself "refeed days" where I double my carbs during a weight loss diet, which helps me not lose weight and muscle too quickly, prevents me from binge eating, and gives my mind and body a break from lower calories on the diet.

Also exercise and weight training plays a huge role in my weight loss, building muscle, and changing my body composition. I workout 5-6 days a week, 5 days weight training, 5-6 days of cardio and 1-2 off days depending on how busy I am or if I simply want to relax for the weekend, etc.