By the time a child is 4-8 years old, his sugar consumption skyrockets to an average of 21 teaspoons a day. The same study found 14-18 year old children intake the most sugar on a daily basis, averaging about 34.3 teaspoons.
In space, the body begins to adapt to the microgravity environment. NSBRIâs science and technology program is addressing ways to reduce or eliminate many of the changes to the body that impact an astronautâs ability to perform well in space and that might impact their health after returning to Earth.
Nobody knows what the long term effect on the body would be of lunar or Martian gravity because we haven't done the experiments in space and can't do them on the Earth. Could be same as Earth g (normal health and lifespan), could be like zero g (not sure humans can survive two years), could be somewhere in between, could even be worse or better for health than either.