1. They May Make Acid Reflux Worse

Tomatoes are naturally acidic. They are often associated with worsening gastroesophageal reflux disease (GERD), a condition where stomach acid flows back up through the digestive tract and causes irritation.

While tomato consumption doesn’t cause GERD itself, regular consumption may trigger acid reflux and heartburn in people who already have the condition by irritating the esophagus or increasing acid exposure.6

 Large Amounts May Cause Stomach Upset

Tomatoes contain a natural sugar called fructose, which can be difficult for some people to digest.

When it’s not properly digested, gut bacteria can ferment the fructose in the digestive tract, leading to symptoms like an upset stomach, diarrhea, bloating, cramping, and constipation.8 This may be more likely in people with a sensitive digestive system or certain digestive conditions, like irritable bowel syndrome (IBS

They’re High in Histamines

Tomatoes are considered to be a food high in histamines, which are natural chemicals released by immune system cells that aim to defend the body against foreign substance

They May Be Limited in Diets for People With Advanced Chronic Kidney Disease

Tomatoes are naturally rich in potassium, which generally isn’t a cause for concern.

But for some people with advanced chronic kidney disease, consuming tomatoes daily can prevent the kidneys from removing excess potassium efficiently. This results in a higher-than-normal amount of potassium in the bloodstream, which is a condition known as hyperkalemia that can lead to serious complications and require immediate medical attention