Xylitol vs Corn Syrup Solids: which is worse?

What is Xylitol?

Xylitol is a five-carbon sugar alcohol (pentitol) naturally found in birch wood, corn cobs, fruits, and vegetables. It has the same sweetness as sucrose but provides 40% fewer calories and does not raise blood glucose or insulin levels. Most commercial xylitol is produced from xylose derived from corn cob or hardwood hemicellulose hydrolysis.

What is Corn Syrup Solids?

Corn syrup solids are produced by drying corn syrup to a moisture content below 10%, yielding a free-flowing powder. They are composed of a mixture of glucose polymers (polysaccharides) and monosaccharides derived from corn starch hydrolysis. Unlike liquid corn syrup, they are used in powdered products such as non-dairy creamers, infant formula, and seasoning blends.

Documented risks

Xylitol: Xylitol is safe for humans at normal consumption levels. Like other sugar alcohols, it can cause osmotic diarrhea and gastrointestinal upset at doses above 40–70 g/day. Critically, xylitol is highly toxic to dogs — even small amounts (0.1 g/kg body weight) can cause severe hypoglycemia and hepatic failure in canines, as documented in multiple veterinary case reports. The FDA and ASPCA have both issued warnings about xylitol pet toxicity. For humans, it is well-tolerated and has dental benefits.

Corn Syrup Solids: Corn syrup solids contribute to added sugar intake and share the metabolic risks of high-sugar diets, including increased risk of obesity, type 2 diabetes, and dental caries. Their presence in infant formula has raised particular concern among pediatric nutritionists, as they have a high glycemic index and provide no nutritional benefit beyond calories. The American Academy of Pediatrics recommends limiting added sugars for all age groups, including infants. Regulatory agencies have not specifically restricted corn syrup solids.