All healing items (how much they heal & what area theyre located in)

Here are all the Undertale food and healing items and how much they heal

RUINS

Monster Candy - 10 HP
Spider Donut - 12 HP
Spider Cider - 25 HP
Butterscotch Pie - FULL HP
Snail Pie - FULL -1 HP

SNOWDIN

Snowman Piece - 45 HP
Nice Cream - 15 HP
Bisicle - 11 HP
Unisicle - 11 HP
Cinnamon Bunny - 22 HP

WATERFALL

Astronaut Food - 21 HP
Crab Apple - 18 HP
Sea Tea - 10 HP
Abandonded Quiche - 34 HP
Temmie Flakes - 2 hp
Dog Salad - RANDOM (2/10/30/FULL)

HOTLANDS

Instant Noodles - 4 HP (in battle) 15 (overworld) FULL (serious mode)
Hot Dog...? - 20 HP
Hot Cat - 21 HP
Junk Food - 17 HP
Hush Puppy - 65 HP
Starfait - 14 HP
Glamburger - 27 HP
Legendary Hero - 40 HP
Face Steak - 60 HP
Popato Chisps - 13 HP

ENDGAME

Bad Memory - -1 HP (FULL IF LESS THAN 3 HP)
Last Dream - 17 HP