Calcium Propionate vs Corn Syrup Solids: which is worse?

What is Calcium Propionate?

Calcium propionate is the calcium salt of propionic acid, a short-chain fatty acid naturally produced during fermentation. It is one of the most widely used mold inhibitors in commercial bread and baked goods. It works by penetrating fungal cells and lowering internal pH to inhibit growth.

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

Calcium Propionate: Generally recognized as safe. However, a 2012 study in the Journal of Pediatric Child Health (Dengate & Ruben) and a 2019 study published in Science Translational Medicine found that calcium propionate induced insulin resistance in a mouse model and raised metabolic concerns. The 2019 animal study, conducted by Bhatt et al., found that propionate triggered glucagon and norepinephrine secretion. Some open-label human studies and parental reports have linked calcium propionate to irritability, sleep disturbance, and behavioral changes in sensitive children, though these lack robust clinical trial evidence. Most regulatory agencies consider it safe at current use levels.

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.