Sugar

What It Is

Table sugar is sucrose: a disaccharide of one glucose unit joined to one fructose unit. It is the reference point against which every other sweetener on this site is measured — when a guide says a sweetener is “70% as sweet” or “600 times sweeter,” sucrose is the 1.0. It is also the only entry here that is a food rather than an additive, which is why it carries no E number and needs no approval to sell.

The distinction that matters most in the research is not chemical but contextual. Free sugars — the term used in the World Health Organization guideline — covers mono- and disaccharides added by a manufacturer, cook or consumer, plus the sugars naturally present in honey, syrups and fruit juices. Sugar locked inside intact fruit or plain dairy is not in that category. Much of the confusion in public argument about sugar comes from treating those two exposures as the same thing.

Relative Sweetness

Sucrose is the baseline by definition. Its practical advantage is not intensity but balance: the sweetness arrives quickly, peaks cleanly and fades without a lingering tail, and it carries no bitter, metallic or cooling edge that a formulator has to mask. Most of the work involved in replacing sugar is not matching its sweetness — that part is easy — but reproducing everything else it does.

Energy and Glycemic Response

Sugar is assigned 4 calories per gram, the general factor for total carbohydrate under 21 CFR 101.9(c)(1)(i)(B). Its glycemic index is approximately 65 against glucose at 100. That figure sits below pure glucose because only about half of the molecule is glucose once it is hydrolysed; the fructose half follows a different metabolic route through the liver.

On a nutrition label, sugar counts in full: it appears in Total Carbohydrate, in Total Sugars, and — when added during processing or preparation — in Added Sugars. Nothing is subtracted. Every “net carb” calculation elsewhere on this site is a subtraction from this position.

What Sugar Actually Does in Food

Sweetness is the smallest part of sugar’s job. In a formulation it also provides:

• Bulk and structure — volume that fills a measuring cup, and a crystalline matrix that gives cookies their spread and meringues their body.
• Browning — both caramelization and, once inverted, participation in Maillard reactions with proteins.
• Moisture control — sugar is hygroscopic, holding water in a cake crumb and slowing staling.
• Fermentation substrate — yeast eats it; without it, bread and beer do not work the way they are supposed to.
• Preservation — at high concentration it lowers water activity, which is the entire principle behind jam.
• Freezing-point depression — the reason ice cream is scoopable rather than a solid block.

No single substitute on this site does all of that. Allulose comes closest on browning and bulk; the polyols provide bulk but change browning and mouthfeel; the high-intensity sweeteners provide none of it and must be paired with a carrier. This is the real reason sugar reduction is a formulation problem rather than a swap.

What the Guidelines Say

The World Health Organization recommends reducing free sugars to less than 10% of total energy intake in both adults and children, and further suggests a reduction to below 5% — roughly 25 grams, or about six teaspoons, per day for a typical adult.

The strength of those two statements is not the same, and quoting the numbers without the strength misrepresents the guideline. WHO classes the first as a strong recommendation based on moderate-quality evidence from observational studies of dental caries. The second is a conditional recommendation based on very low quality evidence from ecological studies. Both figures are widely repeated; the distinction between them almost never is.

Health Considerations

Sugar carries the strongest evidence base of anything covered on this site — in both directions. The association between habitual high intake and weight gain, type 2 diabetes, cardiovascular disease and tooth decay is consistent across large bodies of evidence, and it is most consistent for sugar-sweetened beverages specifically. Liquid sugar is consumed quickly, displaces little other food, and does not produce the satiety that the same quantity of sugar inside a solid food would.

Two failures of interpretation are common, and they run in opposite directions. The first treats every gram of sugar as equivalent regardless of dose or food matrix, which the evidence does not support — sugar in intact fruit is not the same exposure as sugar in soda. The second treats the beverage findings as evidence that sugar is harmless elsewhere, which is equally unsupported. Dose and form carry the evidence, not the molecule.

Comparison Note

Every substitute on this site is a partial trade. Allulose replicates browning and bulk but is not authorised in the EU. Erythritol provides bulk with no calories but does not brown and has an open cardiovascular question. Stevia and monk fruit supply intense sweetness and nothing else, so whatever fills the cup alongside them is doing the physical work. Xylitol is the closest on texture but still supplies 2.4 calories per gram.

Reducing added sugar is well supported. Expecting a substitute to make an otherwise poor diet healthy is not — and gradually lowering the level of sweetness you expect from food tends to be more durable than an indefinite search for a perfect replacement.