Sugars provide quick energy. Naturally occurring sugars in fruits and dairy come packaged with vitamins, minerals, and fiber. Added sugars provide calories without nutritional benefit.
Deficiency Signs
No sugar-specific deficiency exists. The body can synthesize glucose from protein and glycerol via gluconeogenesis.
Excess / Toxicity
Excess added sugar intake is strongly linked to dental caries, obesity, type 2 diabetes, non-alcoholic fatty liver disease, and cardiovascular disease. WHO recommends limiting added sugars to <10% of calories.
Absorption & Interactions
How It’s Absorbed
Sucrose is split by sucrase into glucose and fructose. Glucose is absorbed via SGLT1 active transport; fructose via GLUT5 facilitated diffusion. Both enter portal circulation to the liver.