Chewing Gum Mod 1.12.2 adds many flavors of gum to Minecraft. Every time you eat gum, it refills one bar of hunger. There are six stages of gum: Gum, Partially Chewed Gum, Somewhat Chewed Gum, Mostly Chewed Gum, Chewed Gum, and Flavorless Gum Wad (Which can’t be eaten). Once eaten, gum will have a chance to move on to the next stage, or it might stay the same. Once you chew your gum enough, it will become a flavorless gum wad (remember those?). These are completely useless and should be thrown away.
Flavorless Gum
Flavored Gum
Then substitute the apple for:
Rainbow Gum: Fill the crafting table up with red, yellow, orange, lime, lapis, purple, and magenta dye, cake, and a flavorless gum to get Rainbow Gum.
For 1.7.2
http://dl.niceminecraft.net/download.php?file=c363ad31cd676037678a74acc5f76c92
For 1.7.10
http://dl.niceminecraft.net/download.php?file=388619d3ba0da5a598c4ca727e326255
Credits: APmodS