Oh no, Calories too!!!
It's what you think, and it's not. When you are hypo you don't use calories the same what that you did before, especially if you were hyper before. So you have to learn how your body needs to be fed the way that it is now.
Being hypothyroid means that you have a tendency to have a low metabolic rate. Part of what your meds are doing for you is to get your body working properly and getting your metabolic rate up.
Increasing metabolic rate means that your body is able to digest food better (happier trips to the bathroom) you are able to feel warmer when the weather is cool and better able to handle heat when it's warmer. Your skin is nicer, your hair is nicer, your hair and nails grow - all those wonderful positive things.
But, there is another VERY important thing involved when metabolic rates drop. That, for most folks means weight gain and/or difficulty in losing weight. There is something that you can do to sabotage your metabolic rate, something that so many of us do without even realizing it. What is it?
Not eating enough of the correct foods... correctly.
When you skip breakfast. What does your body do? It says to itself that we're short on calories, turn down the furnace (the metabolic rate) to conserve calories. That also means less energy, less enthusiasm, harder time getting your day going. Eventually you stop to eat. The food hits your tummy and what happens? Your body says hey, got some calories in here, finally, lets not waste them, into storage (fat) they go. Same goes every time you skip a meal. Not good. You are working so hard to get your body working correctly, get you metabolic rate up so that you can LIVE again, starving it by skipping meals defeats all your efforts and increases the likelihood that you will gain weight, or fail to lose.
Your body doesn't work the way that it used to, the best thing that you can do for yourself is to learn how to take care of it now.
What can you do to help? It's simple, really.
The first step is to stop skipping meals. The next step is to make sure that you keep your blood sugar levels even.... how?
Eat several small meals throughout the day. Start by taking what you eat now and breaking it up into 5 to 7 meals a day. For some that means adding more food. For others, you'll find out that you're still gonna have to reduce calories. Which ever group that you fall in to, it's worth taking some time to find your ideal eating program to get to and maintain a healthy weight for you. It's not just your weight that this benefits, it also helps your conversion (T4 to T3) that will contribute to your better health. Check out mini-meals for more on how to do that.