NEW DELHI: A diet rich in certain proteins could significantly weaken cholera infection, offering a low-cost and low-risk complement to existing public health measures, according to a new study — a finding that could have important implications for India, where cholera continues to pose a seasonal threat in areas with poor water and sanitation.
Researchers from the University of California, Riverside (UCR) have reported that diets high in casein, the main protein found in milk and cheese, and wheat gluten sharply reduced the ability of Vibrio cholerae, the bacterium responsible for cholera, to colonise the gut. The study, published in Cell Host and Microbe, suggests that diet alone can dramatically influence the severity of infection.
“I wasn’t surprised that diet could affect the health of someone infected with the bacteria. But the magnitude of the effect surprised me,” said Ansel Hsiao, associate professor of microbiology and plant pathology at UCR and the senior author of the study. “We saw up to 100-fold differences in the amount of cholera colonization as a function of diet alone.”
Current treatment strategies focus primarily on oral or intravenous rehydration, which saves millions of lives. Antibiotics may shorten the duration of illness but do not neutralise the toxins released by the bacteria. Moreover, excessive reliance on antibiotics carries the long-term risk of resistance.
Against this backdrop, the researchers set out to explore whether diet — known to strongly shape the gut microbiome — could also influence how invasive pathogens behave once inside the body. To test this, they examined the impact of different diets on cholera infection in mice.
The team compared diets high in protein, simple carbohydrates and fat. While high-fat diets had little effect and carbohydrate-heavy diets offered only limited protection, the results with protein-rich diets were striking.
“The high-protein diet had one of the strongest anti-cholera effects compared to a balanced diet. And not all proteins are the same,” Dr. Hsiao said. “Casein and wheat gluten were the two clear winners.”
Mice fed diets rich in dairy protein and wheat gluten showed a dramatic reduction in bacterial colonisation, effectively preventing Vibrio cholerae from establishing itself in the gut.
Further investigation revealed how these proteins exert their effect. The researchers found that casein and wheat gluten suppressed a key virulence mechanism used by the cholera bacterium — a microscopic, syringe-like structure on its surface known as the type 6 secretion system (T6SS). This structure allows the bacterium to inject toxins into neighbouring cells and kill competing microbes, enabling it to dominate the gut environment.
When the T6SS was muted, cholera bacteria struggled to kill other gut microbes and failed to gain a foothold. “When this system is suppressed, cholera has a difficult time killing other bacteria and taking up space in the gut,” the researchers noted.
The findings are significant because they point to a non-drug-based strategy for reducing disease severity. While antibiotic-resistant cholera is not currently a major global threat, bacteria are known to adapt rapidly.
“Dietary strategies won’t generate antibiotic resistance in the same way a drug might,” Dr. Hsiao said. “Wheat gluten and casein are recognized as safe in a way a microbe is not, in a regulatory sense, so this is an easier way to protect public health.”
Although the experiments were conducted in mice, the researchers believe similar mechanisms may operate in humans. Dr. Hsiao said future studies would examine the impact of high-protein diets on human microbiomes and assess whether dietary modulation could also limit other infectious pathogens.
“Some diets will be more successful than others, but if you try this for pathogens other than cholera, I suspect we’ll also see a beneficial effect,” he said. “The more we can improve peoples’ diets, the more we may be able to protect people from succumbing to disease.”
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