Thyroid hormones can provoke depression, memory impairment and they affect cellular metabolism and the process of obtaining and using energy. The brain is the most metabolically active organ. If something is wrong with the thyroid hormones, the first organ that will affect it will be the brain, the disruption of which will cause mood swings.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.