Can the density of the entire human body be increased at all? And if yes, then what is the maximum amount to which it can be increased to?

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    $\begingroup$ The molecules that make up our body have a certain mass. Arranged as they to make up the structures of our body, they have a certain density. You simply can't change that, unless you make people out of silicon or gold or something. But then, they wouldn't be humans. I don't understand the mechanism for increased density, so I think this question is 'unclear what you are asking' and I'm voting to close. $\endgroup$ – kingledion Jan 23 '18 at 1:53
  • $\begingroup$ Consider bionics. Replace part of your body with machines. The density might double $\endgroup$ – Raditz_35 Jan 23 '18 at 7:13
  • $\begingroup$ Welcome to WorldBuilding! What is your source for the statement that increasing the density of the humnan body 2 to 3 times would allow it to stop bullets/bombs/knives/...? Please edit your question to make it clearer what you are trying to do and what makes you think this would do what you described. If you have a moment please take the tour and visit the help center to learn more about the site. Have fun! $\endgroup$ – Secespitus Jan 23 '18 at 9:22
  • $\begingroup$ pretty much you'd have the mess with the strength of the inter-atomic forces that control the density of the chemicals that make our bodies, this would involve huge abounts of energy, if by some miracle the process was survivable, the huge energy density would be worse than your weight in TNT, a bullet could set it off. $\endgroup$ – Jasen Jan 23 '18 at 9:27
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    $\begingroup$ Looking slightly beyond the literal question as asked, you might be interested in my old question Could a creature evolve a biological “bulletproof vest”? $\endgroup$ – a CVn Jan 23 '18 at 14:44

There's two ways to increase your density, but both are exorbitantly expensive and probably wouldn't make you bullet proof.

By living on a diet of food made with heavy but stable rare isotopes of the normal atoms, you might be able boost your density by as much as 20%! It would be laughably expensive, and probably wouldn't make you bullet proof though. Then again, I don't suppose anyone's actually tried yet! These heavy elements would include things like using Deuterium in the place of Hydrogen, using Oxygen-18 in the place of Oxygen-16 and so on. As an item of note, these isotopes do exhibit slightly different chemistry from normal, so some minor-to-moderate physiological maladies may result in a real world example.

After that, you could probably boost density by an additional 20%-40% by having the person eat many kilograms of Gold nanoparticles. Eukaryotic (eg. people) cells can soak up relatively huge amounts of these little particles without having problems. Since the particles are mostly absorbed through phagocytosis (the same mechanism our white blood cells use to eat and kill bacteria), the main health risk would be increasing the white blood cells' mass too much relative to the rest of the blood and body. Other cells will absorb them as well, but to a lesser degree.

Again, I don't think these would make you bullet proof, but they would make you heavy! Perhaps a futuristic flexible body-armor would be a more functional alternative? In any case, best of luck with your world.

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