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''Jelly Belly'' is a [[TheEighties 1981]] YA book written by Robert Kimmel Smith. The protagonist is Nathaniel "Ned" Robbins, an 11-year-old boy who loves to eat and weighs over 100 pounds. Sure, he's on a strict diet but he still isn't losing weight due to constant cheating. His parents decide to send him to a summer diet camp, hoping he'll have better luck there than at home.

Ned is horrified by Camp Lean-Too's strict policies, but soon finds he's not alone: Richard Napoli, Darryl "Hog" Hawkins and Max Cohen are veterans of the camp who are more than happy to help Ned through the hard times ahead. Together, the four boys find ways to cheat the system and indulge themselves without getting caught. Somehow they all manage to lose weight despite their candy bar binges and stolen cheese sandwiches from the camp kitchen.

The real trouble starts when Ned realizes he ''wants'' to lose weight the right way, but it's not going to be easy with Grandma always cooking up her delicious, fattening meals and confections. But when there's a will, there's a way.

May have been the inspiration for the 1995 film ''Film/{{Heavyweights}}''.
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!!This story contain examples of:

* AmbiguouslyJewish: Grandma Rose.
* BigBrotherMentor: Jamie is literally this to Ned, with his parallel storyline of trying to do better on the track team
* BigEater: Nathaniel "Ned" Robbins in Jelly Belly starts out as this. His friends at summer diet camp -- Richard, Hog and Max -- are straight examples, especially Richard. And Richard's parents.
* BrattyTeenageDaughter: Elizabeth, who's always snide about Ned's weight.
* TheBully: Phil Steinkraus, who's always mocking Ned over his weight, stealing his lunch, and saddles him with the cruel nickname "Jelly Belly".
* [[CallingTheOldManOut Calling The Old Lady Out]]: Ned ''tries'' to avoid this when he talks to Grandma about his diet, but she doesn't listen and he ends up yelling and hurting her feelings. Luckily, he apologizes and she agrees to help him lose weight.
* ColdTurkeysAreEverywhere: Ned Robbins is on a strict diet and has to put up with his family chowing down on delicious, high-calorie foods, like spaghetti and breaded veal with blueberry pie for dessert, while he's stuck eating nothing but lean, broiled meats and vegetables. Even when he becomes more serious about losing weight and eating healthier, staying away from junk food is still an effort in and of itself.
* ComfortFood: Deconstructed. BigEater Ned struggles with his weight throughout the book, not helped by the conflicting food messages he receives from his family. His parents tell him he needs to lose weight, but Grandma Rose continues to make him fattening meals and sweets as she truly believes food equals love.
* {{Determinator}}: Once Ned decides he truly wants to lose weight, he goes at it full throttle.
* DietEpisode: The first half of the book is this, right down to the boys getting caught sneaking candy and snacks. Subverted when Ned gets serious about losing weight and is better able to withstand temptation.
* EmbarrassingNickname: Richard's parents call him "Roly". Likewise, Phil Steinkraus tauntingly refers to Ned as "Jelly Belly".
* FatCamp: Where half the story takes place. While it's not the sadistic kind, and protagonist Ned would actually like to be thinner, he hates the place and befriends kids who have no intention of losing weight or keeping it off if they do.
* FoodPorn: The book has this in ''spades''. Considering the story's told from the perspective of a kid who loves to eat, it's to be expected.
* FourTemperamentEnsemble: Ned is Melancholic, Richard is Choleric, Hog is Phlegmatic and Max is Sanguine.
* IAmBigBoned: Ned's grandma insists he's not fat, he's just big-boned like her. Even after Nathaniel himself tries to get her to acknowledge that he really does need to lose weight and that she could help by not cooking so much food for him. At least one of the kids at camp has parents who are the same way.
* IfItTastesBadItMustBeGoodForYou: Almost all of the food at Camp Lean-Too fits the bill, as does Ned's diet dinner shortly before he leaves for camp. Later subverted when Ned realizes how tasty and filling some healthier foods can be.
* LittleMissBadass: Ned's friend Libby, afraid of the class bully? Hell no!
* KnownOnlyByTheirNickname: Hog is only called "Darryl" twice throughout the book. Ned himself is rarely ever called by his real name, either.
* PhoneaholicTeenager: Ned's sister Elizabeth. As one line describes it:
-->Last year she got her own telephone, and like Jamie says, "We haven't seen her since."
* SupremeChef: Grandma Rose, big time. Also Richard's mother.
* ThroughHisStomach: It's implied that Grandma and her late husband's relationship was built heavily on this trope. A non-romantic example has Ned mentioning how Elizabeth's boyfriends often ignore her in favor of Grandma's freshly baked pies or cakes.
* TrademarkFavoriteFood: Max Cohen's Hershey Bars, Ned's fondness for Milky Way bars.
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