The instructions at the pharmacy counter cover timing, whether to take it with food, and finishing the course. They say nothing about what goes on the plate. A new study suggests that silence may matter.

The study, reported by CIDRAP, found that sugar-rich foods amplify the disruption antibiotics cause in the gut. Every patient in it was on antibiotics at some point during the study, and many received broad-spectrum drugs, the kind known to significantly disrupt the balance of good and bad bacteria. The study's sample size has not been published, and the work is described as suggesting a link, not proving one.

A broad-spectrum antibiotic is a blunt instrument. It cannot tell the bacteria causing your infection from the thousands of species that were quietly digesting your lunch. The community thins out, and what survives inherits whatever food arrives next. Sugar is an easy food for gut bacteria to use, and the reading consistent with the study is that a depleted community fed sugar reorganises worse than one fed something slower. That is a hypothesis about mechanism. The coverage reports the association.

Here is the part the pharmacy counter will not mention. An instruction to eat less sugar for the length of a course costs nothing, which may mean few have a reason to fund a trial of it. Drug makers pay for trials of pills. Probiotic sellers pay for trials of probiotics. A rule about the plate is unlikely to come with a sponsor or a price tag.

The supplement aisle is not waiting for a sponsor. A survey of nearly 63,000 Americans, which we covered on 27 September, found probiotic and fiber supplement use rising while fermented-food and fiber intake stayed flat. People are already buying the capsule instead of changing the meal.

No trial of the plate is attached to this finding. The patient on day three of a course will make the call alone, standing in front of the same shelf.