Thyroid issues are prominent as a fairly common problem among a large majority of the population; especially in the U.S, with the weight epidemic and what-have-you. If you feel like you need to address any thyroid complications that you may have, get blood work done by your doctor. This is really the only effective way to tell if your thyroid gland is functioning appropriately. Never take thyroid hormones that were not prescribed by your doctor.
Also discuss all of your diet plans with your doctor as well as for sound medical advice. Don't take suggestions from other people (including me) unless you run them by your doctor first!
I've looked up your height and weight ratio, and 175 pounds is a perfect goal to reach for. It is precisely where you need to be as a healthy male individual. A top hint is to avoid Yo-yo dieting; if this diet is something you desire, commit to it or you will invariably kill your progress. This means not entirely cutting sweets out of your diet if you currently have an addiction to them. But if it is a part of your diet that you cut sweets, then good, that is far more preferable. If you absolutely
can't, however, make your snacking an isolated incident. Once or twice a week, and it being something that you don't have to store in your house like a bucket of ice cream. Make it a candy bar, or something fleeting as such.
Losing weight isn't all about exercise, either. Eliminate all red meats and most poultry. If you take protein supplements (which I assume you do) you need to consult your doctor about exercising on a diet without red meat, and therefore, less protein which helps build muscle. Your main sources of protein should be from egg whites and fish. I would recommend salmon on account of its low mercury and mild fat content. Fish and egg whites (no yolks at all), but no red meat. If you drink soda and coffee, stop now. Insisting on drinking sodas is one of the largest reasons diets probably yield little results. Drink something like coke zero if you can't kick the habit. And refrain from using anything other than maybe two or three packets of sweetener in your coffee and nothing else for flavor. Don't deep fry, and restrict your general use of cooking oil to a minimum. You shouldn't eat white bread or bagels, so supplement with whole bread. The key is gross fat, and carbohydrate restriction. Take multi-Mineral and multi-vitamin supplements to increase your overall well being.
Carbohydrate restriction is key here. Limit your general carbohydrate consumption to meals and drink more water or watery drinks like tea or no-calorie drink mixes. Eat more fruit and vegetables. Incorporate vegetables into almost every one of your meals if not all of them.
So your meals overall should be abundant in fish or egg whites, contain no meat and a have good degree of vegetables. Meals should contain little butter or oils, with water or something akin as a drink.
If you are a prodigious snacker, you can alleviate want to rummage in your pantry by reading
in between meals or doing something else productive.
Oh yeah, and make sure your fibre is in good order. It's important to poop properly.