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A new artificial intelligence model, DeepSeek-R1, is introduced, demonstrating that the reasoning abilities of large language models can be incentivized through pure reinforcement learning, removing the need for human-annotated demonstrations.

Genetic background, plasma metabolome and dietary data from 4,215 women and 1,490 men reveal 57 metabolites whose associations with dementia risk vary by APOE4 genotype and other risk variants.

The advantage of living in cities compared with rural areas with respect to height and BMI in children and adolescents has generally become smaller globally from 1990 to 2020, except in sub-Saharan Africa.

Obtainment of hydrogen-rich metal hydrides that are high-temperature superconductors has been demonstrated under very high pressure, but is still largely unexplored. Here the authors synthesize CeH₉, with a structure related to solid metallic hydrogen, at relatively low pressure and without need for heating.

Estimates from the Global Dietary Database indicated that 2.2 million new type 2 diabetes and 1.2 million new cardiovascular disease cases were attributable to sugar-sweetened beverages worldwide in 2020, with the highest burdens in sub-Saharan Africa, Latin America and the Caribbean.

Genomic and phenomic screens of 827 wheat landraces from the A. E. Watkins collection provide insight into the wheat population genetic background, unlocking many agronomic traits and revealing haplotypes that could potentially be used to improve modern wheat cultivars.

Ytterbium oxide buffer layer for use in perovskite solar cells yields a certified power conversion efficiency of more than 25%, which enhances stability across a wide variety of perovskite compositions.

Recent estimates of sugar-sweetened beverages (SSBs) intake are generally unavailable. Here the authors show a global SSBs intake of 2.7 servings/week in 2018 in adults (range: 0.7 South Asia, 7.8 Latin America/Caribbean); intakes were higher among males, younger, more educated, and urban adults.

Mutations in glucocerebrosidase (GCase) cause the lysosomal storage disorder Gaucher’s disease and are the most common risk factor for Parkinson’s disease. Using a fusion protein comprising GCase and a transferrin receptor antibody fragment, the authors show that the transferrin receptor pathway can be therapeutically exploited to both pass the blood-brain barrier and efficiently target lysosomal GCase deficiency.

Modeling analysis from the Global Dietary Database estimated that 70% of new global cases of type 2 diabetes are attributable to suboptimal intake of 11 dietary factors, with substantial differences in dietary risks across world regions and nations.

An analysis based on data from the Global Dietary Database shows mean animal-sourced food intakes among children and adolescents increased modestly from 1990 to two portions per day in 2018, but remain low in sub-Saharan Africa, India and Bangladesh.

Dietary quality is reported at the global, regional and national level across 185 countries. Though diet quality increased modestly since 1990 at the global level, in South Asia and Sub-Saharan Africa it did not improve. In some regions, children’s dietary quality is lower than that of adults.

Analysis of HbA1c and FPG levels across 117 population-based studies demonstrates regional variation in prevalence of previously undiagnosed screen-detected diabetes using one or both measures and suggests that use of elevated FPG alone could underestimate diabetes prevalence in low- and middle-income countries.

The mouse neocortex supports sensory performance through transient increases in sensory coding redundancy, neural codes that are robust to cellular variability, and inter-area fluctuation modes that transmit sensory data and task responses in non-interfering channels.

Here, the authors show that the glycosylceramide synthesis inhibitor and FDA approved drug Eliglustat inhibits autophagic degradation of TRAF3 which is a key step for osteoclast differentiation and thereby improves myeloma bone lesions.

From 1980 to 2018, the levels of total and non-high-density lipoprotein cholesterol increased in low- and middle-income countries, especially in east and southeast Asia, and decreased in high-income western countries, especially those in northwestern Europe, and in central and eastern Europe.

Gut bacteria utilize dietary and host oligosaccharides for nutrients. Structural and biochemical evidence now demonstrates a conserved catalytic mechanism but diverse substrate preferences for a family of glycoside hydrolases, explaining how they break down complex glycans.

The beneficial effects of a Mediterranean diet on cardiometabolic health are associated with specific changes in the gut microbiome, suggesting a personalized approach towards cardiometabolic disease prevention.

Pelagibacter simultaneously produces the biogenic gases methanethiol and dimethyl sulfide from dimethylsulfoniopropionate, regulated by a kinetic switch that balances DMSP allocation between each pathway depending on cellular sulfur demands.

A microscopy system that enables simultaneous recording from hundreds of neurons in the mouse visual cortex reveals that the brain enhances its coding capacity by representing visual inputs in dimensions perpendicular to correlated noise.

The diamondback moth, Plutella xylostella is a cosmopolitan agricultural pest. By analyzing 532 genomes from 114 populations around the world, the authors find evidence supporting a South American origin of this moth, and look for signatures of positive selection.

Mannan, a component of yeast cell walls, is shown to be a viable food source for Bacteroides thetaiotamicron, a dominant member of the gut microbiota, which catabolizes the mannan ‘selfishly’—countering the general assumption that multiple members of the gut microbiota take a role in, and benefit from, polysaccharide catabolism.

Yaks have been subject to natural selection, human domestication and interspecific introgression during their evolution. Here, the authors have identified genomic structural variations and the linked genes involved in these processes in domestic yaks, to reveal new insight into genetic basis of phenotypic diversity.

In mouse models of Parkinson’s disease and dyskinesia, striatal spiny projection neurons of the direct and indirect pathways have abnormal, imbalanced levels of spontaneous and locomotor-related activity, with the two different disease states characterized by opposite abnormalities.

The hierarchical deconstruction of the complex pectic glycan rhamnogalacturonan-II by the human gut bacterium Bacteroides thetaiotaomicron reveals seven new families of glycoside hydrolases and three catalytic functions not previously observed.

O-GlcNAcylation is a known post-translational modification, but analysis of nascent proteins now demonstrates that it also occurs during translation, preventing proteolytic degradation of modified proteins by blocking ubiquitination.

Contrary to the view that urbanization is a major driver of the global rise in obesity, the global increase in body-mass index is shown to be mostly due to increases in the body-mass indexes of rural populations.

Polymer–lipid–peptide nanoparticles carrying an antiplatelet antibody and a chemotherapy drug deplete tumour-associated platelets to increase vascular permeability and augment the accumulation of the drug in tumours.

Wang et al. demonstrate that the effects of aberrations and scattering caused by the mouse skull can be reduced with three-photon microscopy. Their approach allows structural and functional imaging of the brain through an intact skull.

A multi-beam two-photon microscope enables imaging of calcium activity or neurovascular dynamics in the brain with millisecond-scale temporal resolution.

Genetically encoded optical voltage sensors measure the electrical activity of various tissues with limited effectiveness, due to the sensors’ suboptimal performance metrics. Gong et al.create a sensor with increased brightness, fast kinetics and improved dynamic ranges when compared with previous sensors.

Cytoplasmic chromatin activates the innate immunity cytosolic DNA-sensing cGAS–STING pathway, leading both to short-term inflammation to restrain activated oncogenes and to chronic inflammation that associates with tissue destruction and cancer.

In parallel with an ongoing human clinical trial, genetically engineered mouse models of lung cancer with different genetic alterations are treated with chemotherapeutic agents; the results have implications for the clinical trial.