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Well, I'm 47 years old, 6' tall and have been about 155 lbs all my adult life. I can eat 12 cupcakes and I will still be 155 lbs tomorrow. I have a ridiculous metabolism and always have...I know from experience on the other end of the spectrum. I eat 4000 calories a day and still don't gain weight. People are different and it varies greatly.
The body is definitely capable of producing states where more energy is consumed than what is put in, leading to people losing weight really fast, and incapable of putting on fat.
Hyperthyroidism is just one of the many conditions that can cause this. An excess of the thyroid hormone overstimulates metabolism and speeds up the nervous system, with effects comparable to taking a shot of adrenaline.