The thin watery layer that often forms on top of yoghurt is not a sign that the product has spoiled, but a natural separation of whey—a nutrient-rich liquid that contains valuable proteins, vitamins and minerals. A Florida-based gastroenterologist is encouraging people to stop pouring it away, saying the common kitchen habit may deprive them of some of yoghurt's key nutritional benefits.

Dr. Joseph Salhab, a gastroenterologist and health content creator who specialises in digestive, liver, pancreatic and nutrition health, recently addressed the issue in an Instagram video shared on July 1. In the video, he urged consumers not to discard the liquid that collects on top of Greek yoghurt. "Before you pour out that liquid on top of your Greek yoghurt… don't," he said, explaining that the layer is simply whey that naturally separates during storage and remains perfectly safe to consume.

Whey is one of the two primary proteins found in milk, the other being casein. It contains high-quality protein, calcium, potassium, phosphorus and several B vitamins, all of which contribute to muscle repair, bone health and overall nutrition. In addition to its nutrient profile, whey also contains some of the probiotics naturally present in yoghurt, which support gut health by promoting a healthy balance of beneficial bacteria in the digestive system.

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Experts note that the separation of whey is completely normal, particularly in natural and Greek yoghurts that contain fewer stabilisers than heavily processed varieties. Factors such as transportation, storage and temperature changes can cause the liquid to rise to the surface over time. Rather than indicating spoilage, the presence of whey simply reflects the yoghurt's natural composition. Stirring the liquid back into the yoghurt restores its original texture while preserving its nutritional value.

Yoghurt itself is widely regarded as a nutrient-dense food that provides complete protein, calcium and probiotics that support digestive health. Regular consumption has been associated with improved gut microbiome diversity, better digestion and enhanced feelings of fullness, making it a popular choice for breakfast, snacks and post-workout meals. Health professionals recommend choosing plain or unsweetened yoghurt whenever possible to reduce added sugar intake while maximising nutritional benefits.

While whey separation is harmless, consumers should still check for genuine signs of spoilage before eating yoghurt. A sour odour beyond its normal tanginess, visible mould, unusual discolouration or an expired product that has been improperly stored may indicate that it is no longer safe to consume. Otherwise, the next time a watery layer appears on top of your yoghurt, experts advise simply stirring it back in rather than pouring it away, allowing you to enjoy the full range of nutrients the product has to offer.

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