Can common food additives affect gut bacteria?

What is actually in it

Packaged snacks, canned soups, dressings, ice cream, protein bars, and flavored drinks often use additives for texture, shelf life, sweetness, color, or thickness.

Examples include polysorbate-80, maltodextrin, carrageenan, calcium propionate, potassium sorbate, sodium benzoate, sodium sulphite, and xanthan gum.

What the research says

A 2026 Nutrients study tested 12 food additives in stool-sample fermentations from healthy adults and adults with Crohn’s disease in remission.

Several additives changed microbiome structure, bacterial load, or fiber fermentation markers. For example, maltodextrin and polysorbate-80 shifted microbiome structure, and polysorbate-80 reduced total bacterial load in both groups.

This was an in vitro study. It does not prove one packaged snack harms your gut. It does support lowering daily exposure to long additive lists when the same additives show up again and again.

The bottom line

Use ingredient labels as a pattern check. If most pantry foods have long additive lists, swap a few daily staples for simpler foods. Cooking extra portions and storing leftovers in glass makes lower-additive meals easier on busy days.