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Kinda like pop rocks puts bubbles of carbon dioxide gas into their candy to make it pop, If someone put bubbles of helium into some sort of food light enough then would it float? And how do they even put gas into food in the first place?

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    $\begingroup$ Putting helium into food would not make it float in air. Even if you got helium into puffed up food, it would rapidly diffuse out. $\endgroup$
    – Ed V
    Oct 20, 2021 at 23:46
  • $\begingroup$ Then what about incased food like hard candy (sugar, lactose, corn syrup, and flavors, frozen together)? $\endgroup$
    – reid
    Oct 20, 2021 at 23:50
  • $\begingroup$ Helium will still diffuse out and air will diffuse in. And it will not float in air. You might be able to make a “molecular gastronomy” foam, using helium as the fill gas, then float that in a dense gas, but it would not last long. $\endgroup$
    – Ed V
    Oct 20, 2021 at 23:54
  • $\begingroup$ See this for how they get carbon dioxide into Pop Rocks. $\endgroup$ Oct 20, 2021 at 23:54
  • $\begingroup$ I see, is that just because helium is a different gas? $\endgroup$
    – reid
    Oct 20, 2021 at 23:57

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On the other hand, some of the more dense gases might float a sufficiently "fluffy" food (cheese puffs? popcorn? That's another question...). You could fill a bowl with perfluorobutane, halocarbon 610, with density around 11 kg/m3 at ~0 °C and see what comes up.

There are denser gases, such as uranium hexafluoride, $\ce{UF6}$,with density around 14 kg/m3 at ~50 °C, but that's nasty stuff with which to work, worse than perfluorobutane.

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