Candy is the least hidden place sugar hides in the food supply. And yet the amounts, and the chemistry behind different textures, are worth understanding in detail.

Sugar Content in Common Candy

Candy Serving Sugar
Skittles 1 oz (28g) 25g
Starburst (4 pieces) 42g 27g
M&Ms (1 package) 47g 30g
Reese’s Peanut Butter Cup (2) 45g 22g
Snickers bar (regular) 52g 27g
Kit Kat (standard) 42g 22g
Twizzlers (4 pieces) 45g 19g
Gummy Bears (10 pieces) 30g 22g
Jelly Belly (35 pieces) 40g 32g
Haribo Goldbears (serving) 46g 32g
Pixy Stix (1 large) 9g 9g
Cotton candy (1 cup) 15g 15g
Candy corn (22 pieces) 40g 32g

Most candy is 65-85% sugar by weight. The remainder is fat (in chocolate), water, colorings, flavorings, and stabilizers.

The Chemistry Behind Candy Textures

Sugar is the same molecule across all these products, but manufacturing process determines texture completely.

Hard candy (lollipops, Jolly Ranchers): Sugar syrup cooked to 300°F+ (hard crack stage). At this temperature, water content drops below 2%, preventing crystallization. The result is an amorphous glass, technically a liquid that flows too slowly to be perceptible. Any contamination (dust, undissolved crystals) triggers crystallization, making candy opaque and grainy.

Gummy candy: Gelatin, denatured collagen protein, forms a protein network that traps sugar syrup and water. Pectin-based versions (often labeled vegan) use polysaccharide gels instead. Gummies are typically 60-65% sugar with 10-15% gelatin/pectin. The gel prevents complete water evaporation, keeping them chewy rather than hard.

Chocolate: Cocoa mass, cocoa butter, sugar, and milk solids are conched (mixed under heat) for 24-72 hours to coat sugar and cocoa particles with fat. Tempering aligns the Type V cocoa butter crystal structure, giving chocolate its snap and gloss. Dark chocolate is 15-40% sugar; milk chocolate 40-55%.

Caramel: Sugar cooked with cream, butter, and sometimes corn syrup to 245°F (firm ball stage). The Maillard reaction between reducing sugars and milk proteins creates the hundreds of flavor compounds, buttery, nutty, bitter, that distinguish caramel from plain sugar. Corn syrup is often added because its glucose and fructose chains prevent sucrose crystallization, keeping caramel soft.

Fondant and fudge: Unlike hard candy, fondant is deliberately crystallized — but into crystals smaller than 20 micrometers, below the threshold of grittiness. This requires seeding with existing crystals and vigorous agitation during cooling. The smooth, creamy texture of good fudge is thousands of microscopic crystals dispersed in syrup.

The Serving Size Problem

Candy packaging exploits the FDA’s flexibility in serving size definition. Regulations require that serving sizes be “customary consumption amounts”. But for candy, where consumption is discretionary, manufacturers often define serving sizes smaller than anyone actually eats.

A Snickers King Size bar (92g) is labeled as two servings at 46g each (27g sugar/serving). Most people eat the whole bar, 54g of sugar. The bag of M&Ms purchased at a movie theater concession stand contains roughly 5 “servings.”

The FDA’s 2016 Nutrition Facts update required that manufacturers use serving sizes people actually eat for single-serving containers. But multi-serving packaging still allows manufacturers to choose serving sizes that keep the per-serving numbers looking smaller.

Halloween and Consumption Psychology

Miniature “fun size” candy creates an interesting psychological phenomenon: the smaller size removes the normal inhibition around eating a whole candy bar, allowing multiple bars to be eaten without the psychological accounting applied to a single full-size bar. Research on unit size and consumption finds that smaller units consistently lead to higher total intake — a documented “small is beautiful” effect in food psychology.

See Also

Sources:

  • McGee H. On Food and Cooking. Chapter on sugars, syrups, and confections, detailed candy chemistry
  • Hartel RW & AK Hartel. Candy Bites: The Science of Sweets. Springer 2014
  • FDA Serving Size guidance: fda.gov/food/nutrition-facts-label/how-understand-and-use-nutrition-facts-label