Calcium Propionate vs Allulose: 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 Allulose?

Allulose (D-psicose) is a rare sugar monosaccharide naturally present in trace amounts in wheat, figs, raisins, and jackfruit. It has about 70% of sucrose's sweetness but provides only 0.4 kcal/g (about 10% of sucrose's calories) because it is absorbed but not metabolized. The FDA exempted allulose from the 'total sugars' declaration in 2019.

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.

Allulose: Generally considered safe with a favorable glycemic profile. Human studies show that allulose does not raise blood glucose or insulin. GI effects (bloating, abdominal cramping, diarrhea) have been reported in dose-response studies above 0.4 g/kg body weight; a 2016 study in the journal Food & Chemical Toxicology established a no-observed-adverse-effect level (NOAEL) in humans. Compared to erythritol, no cardiovascular concerns have been raised in the literature.