So I've been running into a small problem sometimes when modding. I'll suddenly have infinite health. TNT, falls, drowning, lava, zombies, skeletons, fire.. nothing damages me. I'm sure some of you have also run into this issue. Then there's the opposite: full health + armour, but even a slight amount of damage kills me. Both of these can be extremely easily fixed by eating FOOOOOOOOOD (yay, food). I find cooked porkchops work the best. Just munch on one or two, your health bar/screen will act like you've just been damaged and then you should be fine from there.