Not Only Sugar is Sweet

by Food and Drug Administration (FDA)

Plain table sugar and its numerous taste-alikes may be one of our most popular food commodities. People come by their love for sweetness naturally. According to the experts, humans are born generally preferring sweet over bitter or sour tastes.

Sweeteners make many foods taste better. And natural sugars have a host of other valuable culinary?and practical?uses, including adding bulk to baked goods, helping foods to brown, and facilitating fermentation. But despite their immense popularity, sweeteners, particularly table sugar, have generated their share of sour publicity because of health concerns.

What Is Sugar?

Traditionally for most consumers the generic term ?sugar? means simply the white sugar crystals, or table sugar, that are stirred into or sprinkled on foods.

These familiar crystals are technically known as sucrose. Sucrose is a disaccharide — that is, it's composed of two simple sugar units, in this case, glucose and fructose. White sugar comes from sugar cane or sugar beets that have undergone a rigorous refining process. White sugar crystals can be used as is, compressed into cubes, or further pulverized to superfine, then to confectioner?s, or powdered, sugar. Brown sugar results from mixing white sugar crystals with molasses. Other forms of sucrose are beet sugar, maple sugar, turbinado sugar, and raw sugar.

Sucrose, however, is only one of a subgroup of sugars (see accompanying chart), and all sugars are carbohydrates. Monosaccharides, or single sugar units, include glucose, fructose and galactose. Monosaccharides also are the digestive end product of polysaccharides, the complex carbohydrates (starches) in fruits, grains and vegetables. Other disaccharides besides sucrose include lactose (glucose and galactose), also called milk sugar, and maltose (two units of glucose), also called malt sugar.

For labeling use and for making comparative claims, the Food and Drug Administration defines sugars as all mono-, di-, tri-, and tetrasaccharides and their derivatives, such as sugar alcohol, says Youngme Park, Ph.D., a nutritionist with FDA's Center for Food Safety and Applied Nutrition. He says this includes all carbohydrate sweeteners with the same functional and physiological effect that can be used interchangeably in the food supply.

After complex carbohydrates are broken down to simple sugars (most sugars and carbohydrates are eventually broken down to glucose), the sugars are absorbed into the bloodstream and go to the liver. There they may be stored as glycogen or used immediately as glucose for energy by the body or brain.

"The body uses glucose as its simplest form of energy," says Judith Wurtman, Ph.D., research scientist in the Department of Brain and Cognitive Sciences at the Massachusetts Institute of Technology. "So for people who need calories, that is, those who are recovering from an operation or who are shipwrecked, sugar can keep them alive."

Thomas Jukes, Ph.D., professor of biophysics at the University of California at Berkeley, tells of his experiments feeding laboratory rats protein, vitamins, minerals, and sugar as the sole source of carbohydrates. The rats thrived, he says. "Fish is not a brain food," concludes Jukes. "Glucose is."

Sucrose occurs naturally in most green plants, says Sarah Setton, vice president for public affairs, The Sugar Association, Washington, D.C. It is produced by photosynthesis, which is the use of the sun's energy in the formation of food by plants. People would have to stop eating fruits and vegetables and any products incorporating them to cut sugar out of their diet. People seem to think that there is a difference between sugar in an apple and sugar in the sugar bowl," she adds. "But the way the body uses sugar is all the same. The body can?t tell where the sugar is from."

A Taste for Sweets

Americans have become conspicuous consumers of sugar and sweet-tasting foods and beverages. We have developed a relentless sweet tooth, "a severe addiction to sweetness," says Joan Gussow, Ed.D., professor of nutrition and education at Columbia Teachers College, Columbia University in New York City.

According to U.S. Department of Agriculture data on the amount of caloric sweeteners used in food, there has been an increase of more than 16 percent on a per person basis over the past two decades, and more than half of the increase has occurred in the past five years. Caloric sweeteners include sugar, high-fructose corn syrup, pure honey, and edible syrups.

Paul Lachance, chairman of the department of food science at Rutgers University in New Jersey states it another way. He estimates that, based on a 2,000-calorie-a-day diet, the average American consumes about 300 calories from sugars added to food. That comes to nearly 14 teaspoons of table sugar a day.

Gussow has her own theory about why sugar is so prominent in the American diet. It's for taste, she says. "I grow my own vegetables and fruit. And when I pick, cook and eat my parsnips, for example, they are as sweet as sugar," she says. "But food is shipped all over the place, and when food gets too old, much of the sugar turns to starch. The natural sweetness is gone, and people sugar food to give it flavor."

As yet, no scientist has established any limits for sugar consumption. In the typical American diet today (composed of about 45 percent carbohydrates, 20 percent protein, and 30 to 35 percent fat) all added and naturally occurring sugars account for about 21 percent of the total daily caloric intake. A 1986 FDA report estimated that sugars added to food accounted for 11 percent of calories consumed.

Yet if people eat increasingly larger quantities of caloric (nutritive) sweeteners in general, these could compete with and crowd out other nutrients, warns Jane Hurley, associate nutritionist at the Center for Science in the Public Interest, Washington, D.C. People may consume many of their calories each day from a sugary soft drink or candy bar. "Those foods have few important nutrients we need," she says. "People are better off having an apple as a snack than a candy bar."

About the Author

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FDA is A United States government body that oversees medical devices, including contact lenses, intraocular lenses, excimer lasers and eyedrops. In the US, these products must be approved by the FDA before they can be marketed.