If you have 75 to lose, you should be responding to low carb consistently, unless its just processed food with "low carb" on the box.
For example, real food, lean protein, etc is different than "low carb" bread and pasta and a lot of products with "low net carb" on the label.
Here is what worked for me---Lost 120 lb in less than a year.
I was seeing a thyroid/hormone doc too.
breakfast is 2 scrambled eggs with one tsp butter or omelette everyday
morning snack - half atkins advantage bar. Black coffee. Sometimes sliced meat or half a sausage
Lunch - Grilled chicken, tuna or other meat with salad and 2tsp aoli or mayo (full fat)
afternoon snack - other half atkins bar, 2 oz brie,
if working late will sometimes have another Atkins bar or another slice of cheese or 100gm tuna (sugar free)
dinner - grilled meat, steamed veges. One or two squares of sugar free chocolate (sweetened with Stevia), but not every day.
Occasionally have a coffee with cream (not every day, only once or twice a week)
Drink - water, black tea and coffee, occasional diet pepsi (but cutting back to one or two a week)
I eat no milk, bread, grains, yoghurt, fruit, cereal. I don't use sweeteners in tea or coffee. The only processed low carb foods are Atkins bars, sugar free chocolate and mayo/aoli. I do 99% of my own cooking.
Interestingly the sugar free chocolate and Atkins bars don't upset my GIT at all, so I wonder if I am one of those people who can absorb sugar alcohols.
I have a desk job with long hours, so activity is an issue.
Thanks for any advice you can give.