Does Low Thyroid Output Prevent Weight Loss?

If you have worked in the health and wellness field you’ve likely heard someone fatalistically blame their thyroid gland for pretty much everything.

This makes sense because thyroid hormone affects virtually every system in the human body.

Just searching the google you will find that thyroid hormone accounts for ~70% of our resting metabolism, and hypothyroidism is a big deal with the following significant physiological and cognitive symptomatology--fatigue, muscle weakness, constipation, depression, thinning hair, dry skin, elevated cholesterol, irregular periods, and infertility/higher likelihood of first trimester miscarriages.

But, does altering thyroid hormone levels affect weight gain or loss?