While holding the food item in your hot-bar/hand hold right click.
Hold Right Click.
right click + hold
Carry the food and then right click.
Right click the food item and hold it.
Chose it in your usable inventory and right click.
Tap and hold on the screen.
Right-Click with the food in your hand.
Right click without anything it will eat.
You don't click, you hold the right mouse button down.
Hold your food, an apple for example, and right click (and hold).
Click and hold the right mouse while the chicken is in Your Hand
You right click