Pineapple (Ananas comosus) contains bromelain, a mixture of proteolytic enzymes that has been studied for its effects on the digestive system, particularly the stomach. Bromelain is known for its ability to help break down proteins in the digestive tract, which may support digestive processes and potentially ease symptoms of indigestion. Scientific studies have shown that bromelain can survive the acidic environment of the stomach and assist in protein digestion, which is why pineapple and bromelain supplements are sometimes recommended for digestive support.

While the traditional use of pineapple for digestion is present in some cultures, the primary support for its effect on the stomach comes from modern scientific research on bromelain. Clinical studies and in vitro experiments have demonstrated that bromelain can improve protein absorption and may help reduce inflammation in the gastrointestinal tract. However, the strength of evidence is moderate, and most studies involve bromelain extracts rather than whole pineapple fruit. The amount of bromelain in fresh pineapple is significantly lower than in concentrated supplements, so the digestive benefits from consuming pineapple itself may be limited but are still present.

In summary, the use of pineapple to support the stomach is scientifically plausible due to its bromelain content, with moderate evidence from research. It may provide mild digestive support, particularly in breaking down dietary proteins.