This is important because grains contain three components: the bran, the germ and the endosperm. Ultra-processed breads typically contain flour that’s made from just the endosperm.

Choosing products with a shorter ingredient list can work as a general rule of thumb. But other factors matter too ...

If you don’t see “100 per cent whole grain,” scan the ingredient list to make sure the product doesn’t contain refined grains.

It's not being processed, so we're getting all the benefits of the wheat kernel as it naturally is," Ms. Dhaliwal says, noting the same can be said for whole-grain whole wheat breads.

Processed meats also contain additives, such as nitrates, which can be difficult for the body to digest and can lead to inflammation. Refined Grains: Refined grains include white bread, white rice ...

Fried foods and highly processed snacks or junk foods like pizza or chips can also cause a higher risk of constipation. These foods are generally rich in fat but poor in fiber, which delays digestion.

(Image: GETTY) Poland and Russia, where diets tend to be rich in red meat, processed cuts and potatoes, had the greatest number of cases thanks to diet, according to the figures from 2018.