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Older adults who changed the balance of fat, carbohydrates, and animal protein in their diets showed signs of reduced biological age after just four weeks. The strongest result appeared in participants eating an omnivorous, lower-fat, higher-carbohydrate diet.

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Nature, Published online: 15 September 2026; doi:10.1038/d41586-026-02891-wVoyaging gut-derived immune cells ‘remember’ past stomach infections in mice.

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A mathematical shape famous for covering a surface without ever repeating has revealed an unexpected ability to twist light into unusual chiral patterns. The discovery could lead to new ways of controlling light, polarization, and advanced optical devices.

A 125-million-year-old crocodile fossil has revealed preserved skin, possible sensory organs, sophisticated respiratory structures, and an unexpected pattern on its tail. Ultraviolet light exposed alternating bands that may represent ancient camouflage, potentially preserving the oldest known coloration in a crocodylomorph.

Scientists have uncovered sweeping changes in how the human brain controls and organizes its genome beginning in midlife, offering new clues to why aging sharply increases the risk of Alzheimer’s and other neurodegenerative diseases. One of the biggest shifts occurred between about ages 50 and 75, when many of the brain’s original immune cells declined and were replaced by cells with more inflammatory characteristics. Researchers also found weakening of cells that help maintain the blood-brain barrier, along with widespread deterioration in the genome’s three-dimensional organization.

Microscopic plant remains are revealing how GunaiKurnai ancestors used Cloggs Cave for ritual practices over thousands of years. People deliberately gathered whole grasses, carried them into the dark cave, and burned them in thin layers, leaving behind traces that may span 25,000 years. A standing stone erected around 2,000 years ago and other ritual objects strengthen the evidence that the cave was a long-lived spiritual site.

Simply smelling chocolate helped men complete more leg extension repetitions without making the workout feel harder, with dark chocolate producing the strongest effect. The researchers think familiar food aromas may influence appetite and motivation by making the brain anticipate eating.

The Hunga Tonga eruption may have triggered a surprising chemical reaction that destroyed some of the methane released into the atmosphere. Scientists say the discovery could reshape estimates of methane pollution and inspire new methods for slowing near-term global warming.

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Nature, Published online: 15 September 2026; doi:10.1038/d41586-026-02885-8The scientific panel is welcomed. It must now invite all interested researchers to participate.

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Nature, Published online: 15 September 2026; doi:10.1038/d41586-026-02723-xThe achievements of a visionary mathematician, and a trip to the National Air and Space Museum in Washington DC, in this week’s pick from the Nature archive.

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