If conjoined twins are born as a two-headed person, does that mean that have to consume twice as much food and drink twice as much water to supply two brains? Do they get more easily tired sharing the same organ systems and conservation of energy?
In: Biology
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That’s pretty rare in humans, but I can think of one example–[Abby and Brittany Hensel](https://en.wikipedia.org/wiki/Abby_and_Brittany_Hensel). They are one of only four known sets of “two headed” twins to survive to adulthood and the only set to not suffer from heart issues and other serious problems. They were elementary teachers last I heard, but I can’t find any more recently information.
I couldn’t find any specific information about your questions, but they did have a reality show for a while and there’s loads of information about them, so you might be able to figure it out with some research. At the least, if you can find a way to watch it, you should find their reality show enlightening.
When speaking of a body with two heads and otherwise regular build, the necessary food intake would be higher compared to a body with only one head, but it wouldn’t be twice as high.
The organs would likely be accommodated to the slightly higher ‘workload’ they have to do to sustain the second head. So when given the necessary nutrients they shouldn’t tire more than normal.
Of course Only under the condition that there are no further anomalies in the body that would impact how well e.g. The organs work.
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