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What food transparent humans consume so that others can't see what they have eaten, like what all consumable food is transparent like water.
like how people find it embarrassing when people point out what they eat after seeing what is stuck in their teeth...People might laugh seeing their transparent stomach and laugh at what they ate. So there is a requirement for transparent food.
Or how to make transparent food any chemicals can we create transparent food.
Of course you have transparent food
Your question is “what transparent food can transparent humans consume”. The answer is “whatever food you want”. It’s your world. You decided there would be transparent humans. If you want to decide there is transparent food, I don’t see how that would be a problem to anyone. The hard leap of faith is to believe in a fully transparent body (complete with transparent bones, transparent blood, etc, etc). If you’re comfortable making your reader accept that, there’s really no problem in telling him that some pigs are transparent too.
If you feel the need to “justify” the existence of transparent food
Again, you don’t need to. You can just say it exists. But if you think it needs to be justified, nothing more straightforward, since you already consider having transparent humans. If we assume your humans have naturally evolved to be transparent, then there is a whole evolutionary branch of mammals that is gradually more and more transparent, all the way up to transparent humans. You have plenty of transparent cattle, because somehow developing a fully transparent body is a huge evolutionary leap that took millions of years. It didn’t suddenly appear; it went along with the other changes that led to the emergence of homo sapiens.
Even if for some reasons, your transparent people just became transparent at the snap of a finger, scientists will have definitely studied the bio-mechanisms that allow their bodies to be transparent. From there, they have been able to mimic this property and produce transparent GMOs for your people to eat.
You don’t need transparent food
You could have other mechanisms to avoid showing the content of your guts. For example, if evolution led to animals becoming transparent, it would make sense that they also evolved other traits to help them actually be transparent. As such, those animals have a much faster digestion system; in the wild, they hide to eat and digest everything in about 10 minutes and poop out the rest. Once they are done, they can come out of hiding and comfortably be transparent again. Your humans would just have to eat their tacos in private and wait 10 minutes before they are socially acceptable again.
Clothes?
Humans have already come up with a strategy to cover parts of their bodies they don't want everybody to see. Clothing. Just don't go to your restaurant naked (transparent is not invisible by the way, so if showing your genitalia is still awkward in your world, you're gonna need pants. And invisible or not, it's kind of awkward to rub your genitalia on the same chair as everyone else, no?)
Embarrassment is when someone in a society is doing very different than others.
No embarrassment when it becomes normal
When everybody is doing what others are doing, it becomes normal e.g. becoming naked on a street is embarrassing but it is normal on a nude beach.
Do you laugh at food in someones plate?
When everybody can see what is stuck in others' teeth or inside the stomach, then nobody will laugh. It will be just like everybody can see what food is in others' plate in a restaurant.
Smoothie
Everyone wears clothes so everything below the neck is covered. Only mouth and neck are problems. So
Raw meat of transparent animals
In a world where humans are transparent, there would also exist transparent animals. One can eat raw meat dishes as told here and here. If the refractive index of transparent fluid in the stomach and of raw meat are equal, then raw meat will be almost invisible in the stomach because there would be no reflection at the interface.
If they want totally transparent food then the only answer is cannibalism and eating other transparent humans, that should do the trick.
If that's a bit too gruesome then the next best thing would be camouflage instead of transparency. They could liquidise their food and mix it with a strong food dye. Their digestive organs would then be shown in uniform colour. If they wanted to show off they could even use a different coloured dye at each meal :o)
Distilled spirits
Ethanol has considerable caloric value. It is possible to meet ones caloric needs using ethanol alone. Ethanol is clear and would not be seen in the stomachs of these clear people. The clear people also seem easily embarrassed and likely would be embarrassed by the visibility of their vivid green bile, brown stool forming and moving about in the bowel like little stool animals (which they call stoolimals), and bladders full of yellow urine. Ethanol might help calm those anxieties although since they live on ethanol they would be accustomed to it, and it would take a fair bit.
Of course ethanol calories are "empty" calories and so your clear people would fortify their gin with vitamins and minerals much as breakfast cereal is fortified. Amino acids to meet protein requirements would also be added to the distilled spirits.
Easy. Their unique metabolism allows them to survive on pure methanol. It contains lots of calories and, when digested, turns into carbon dioxide and water.
They can eat other food but, even if it was transparent initially after digestion it turns into you-know-what. Which is in most cases not transparent. Society is ok seeing it. Or it is terribly indecent and transparents cover it up.
You are talking about transparent people, not invisible. The creature in your picture has very visible eyes and some internal organs. If transparent people were shy about their physiology they would wear clothes just like people do.
