alt Hacker NewsI have a friend who doesn't have a sense of smell since birth. It's more of a problem than one would think.
His diet is rather plain, and he doesn't enjoy a lot of food. It's mostly meat, fried things and sweets he enjoys. Most vegetables and low-fat dishes he just can't enjoy at all. Luckily he doesn't get a lot of pleasure from eating and that's what keeps him from getting obese.
It also gives him a lot of anxiety that he or his clothes smell bad. He often just can't assess it from other clues. He often needs to ask people to smell him during the day, which leads to some hilarious situations sometimes, but it's not by choice. It's driven by the fear of smelling bad and not realizing it.
It can also get dangerous in some situations, not being able to smell a gas leak, only noticing smoke once it got so thick it will hurt when breathing, and not being able to smell when food goes bad.
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I wonder how the anxiety developed, I would think they would not be self-aware given they cannot understand it, so maybe they were bullied as a kid by smelling bad once and it created traumatic memories for him as it's sort of an unexplainable thing to his nose.
My mother lost her sense of smell after surgery for nasal polyps in her teens. She was mortally afraid of fire breaking out in the night and not being able to smell it.