4. Weight loss
A faster metabolism often means that nutrients we absorb from the food that we eat are more quickly processed. Energy sources like carbohydrates (also known as sugars) and fat are rapidly consumed. This gives the body more energy than it needs, which is often used in unnecessary movements, shaking, excessive mental activity and vegetative activation.
Since people with hyperthyroidism consume more calories than they actually need, they often lose weight very quickly, and have a very hard time recovering weight, no matter how much they eat, or how many calories their meals of choice actually have. In fact, another usual symptom of hyperthyroidism is an increase in apetite, even if in very rare cases people can actually lose their apetite.
Also, it is documented that some people with hyperthyroidism can have an increased blood sugar level, which isn’t due to any type of diabetes or absortion problem.