Calcium Propionate vs Mono- and Diglycerides: 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 Mono- and Diglycerides?

Mono- and diglycerides are emulsifiers derived from glycerol and fatty acids, most commonly sourced from soybean, palm, or sunflower oil. They are partial glycerides that exist between monoglycerides (one fatty acid chain) and diglycerides (two chains). They are chemically similar to fats but are not classified as trans fats even when made from partially hydrogenated sources.

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.

Mono- and Diglycerides: Generally recognized as safe at typical food levels. However, mono- and diglycerides can be derived from partially hydrogenated oils, meaning they may carry trace trans fats that do not appear on the trans fat label because they are classified as emulsifiers, not fats. Some researchers have noted this labeling gap. A 2019 study published in Lipids in Health and Disease noted potential concerns with industrial trans fatty acids in these additives. For most consumers, exposure is low, and regulatory agencies including FDA and EFSA consider them safe at permitted levels.