True or False: A lack of thyroid activity (hypothyroidism) will impede weight gain.

The statement is false. While hypothyroidism, characterized by low levels of thyroid hormone production, typically leads to weight gain rather than preventing it, it's important to understand the underlying mechanisms. Thyroid hormones play a crucial role in regulating metabolism. They affect how the body utilizes energy, manages fat, and processes carbohydrates. When thyroid activity is deficient, metabolic processes slow down, resulting in a lower basal metabolic rate. This slowdown can result in weight gain if caloric intake exceeds the reduced energy expenditure.

Therefore, a lack of thyroid activity does not impede weight gain; rather, it can contribute to weight gain due to decreased metabolism. This is why individuals with hypothyroidism may find it challenging to maintain or lose weight, contrary to the idea that it would prevent weight gain.