Hypothyroidism or stress put on the thyroid from liver dysfunction caused by a diet including sugar, HFCS, honey, nectar, juice, molasses, maple syrup and white flour products (most breads, crackers and pastas.)
Sugar, etc is high in fructose and fructose is like alcohol to the liver: poisonous when consumed in quantity and chronically.
Fructose is the chief cause of obesity, diabetes II and heart disease. In America, sugars are added to nearly everything processed and we have a LOT of processed food bc we have no time to prepare and cook our meals due to rampant capitalism.
The UK is right behind us, along with China, Japan, Malaysia, Australia, The Philippines, etc.
And you were scared about climate change.
"Sugar: the Bitter Truth " on YouTube
"Fat Chance..." by Dr. Robert Lustig M.D.