Each October, as the days shorten and the air grows crisp, millions of Americans prepare for the beloved – and often sugar-fueled – tradition of Halloween. From jack-o’-lanterns glowing on porches to costumes ranging from the whimsical to the gory, Halloween is a time of playful scares, childhood memories and, of course, candy.
But as the wrappers pile up and the sugar rush hits, there’s something far more sinister brewing beneath the surface: the negative effects of candy on your gut health.
Sugar and other ingredients in Halloween treats can cast a sickly spell on the trillions of microorganisms that reside in your gut, collectively known as the gut microbiome. As a gastroenterologist and gut microbiome researcher at the University of Washington School of Medicine, I have dedicated my career to decoding the cipher of how food affects this microbial community within your gut.
While no candy is truly healthy, some options are better for your gut than others. And there are ways you can help wake your gut from its sugar “spell” after holiday indulgence.
Gut-busting treats
What does all this candy do to your gut?
In a healthy state, your gut microbiome acts like a microbial factory. It digests nutrients your body can’t – such as fiber and colorful, health-conferring plant compounds called polyphenols – and produces important molecules called metabolites that protect against infection and support brain health. It also regulates metabolism, or the transformation of food into useful components that power and grow cells.
A balanced diet keeps your gut’s microbial cauldron churning smoothly. But the concentrated sugar, saturated fat and additives in candy can throw things into disarray by feeding inflammatory microbes that weaken your gut barrier – the protective lining that separates your microbiome from the rest of the body.
Once the gut barrier is breached, even friendly microbes can stir up inflammation, causing health issues ranging from overweight to obesity, infections to autoimmune disease, and mild cognitive impairment to Alzheimer’s.
The food you eat shapes your gut microbes, which in turn shape your overall health.
Sugar and inflammation impair your microbiome’s ability to digest food and regulate metabolism. Instead of producing healthy byproducts – such as butyrate from fiber and urolithin A from polyphenols – candy lacking these nutrients may trick your system into storing more fat, providing less energy for your muscles and brain.
Too much candy can also affect your immune system. A healthy gut microbiome helps your immune system distinguish between friend and foe, reducing the risk of infections and autoimmune disorders. Sugar and inflammation undermine the microbiome’s role in training the immune system to distinguish between harmful invaders and harmless substances. Without a carefully calibrated immune system,…
