Diet & Nutrition

GLP-1 Drugs Suppressed Reward Feeding Through a Central Amygdala Circuit

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GLP-1 Drugs Suppressed Reward Feeding Through a Central Amygdala Circuit

TL;DR: A 2026 mouse study in Nature found that small-molecule glucagon-like peptide 1 receptor agonists (GLP-1RAs), obesity and diabetes drugs built around a glucose-linked hormone pathway, suppressed palatable-food intake through central amygdala neurons that lowered nucleus accumbens dopamine. Key Findings Humanized mouse model: Researchers engineered mice so small-molecule GLP-1 receptor agonists could be studied despite …

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Kynurenine Metabolites Were Higher in Inflammatory Depression

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Kynurenine Metabolites Were Higher in Inflammatory Depression

TL;DR: A 2026 biomarker analysis in Brain, Behavior, & Immunity – Health across antidepressant trials found that kynurenine pathway metabolites were elevated in inflammatory depression compared with non-inflammatory depression and healthy controls, while omega-3 polyunsaturated fatty acid treatment reduced several kynurenine pathway metabolites. Key Findings Study type: a combined analysis of two depression trials testing …

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Virgin Olive Oil Linked Gut Microbes to Cognition

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Virgin Olive Oil Linked Gut Microbes to Cognition

TL;DR: A 2026 study in Microbiome found that in older adults at metabolic risk, virgin olive oil was linked to better cognitive preservation and richer gut microbiota, while common refined olive oil pointed the other way. Key Findings Metabolic-risk cohort tracked over time: The analysis followed 656 older adults who were 55-75 years old, cognitively …

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Teen Diet Review Favored Patterns Over Nutrients

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Teen Diet Review Favored Patterns Over Nutrients

TL;DR: A 2025 study in Nutrients found that a systematic review of adolescent diet and mental health found the clearest readout for whole dietary patterns, while single nutrients and supplement-style interventions looked less consistent. Key Findings 19 studies reviewed: The review covered six randomized controlled trials and 13 prospective cohort studies. Diet patterns looked clearer: …

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Coffee Intake Shifted Gut Microbes, Stress, and Cognition Markers

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Coffee Intake Shifted Gut Microbes, Stress, and Cognition Markers

TL;DR: A 2026 human microbiome and intervention study in Nature Communications found that coffee drinkers showed distinct gut microbiome composition and lower several microbial metabolites, while caffeinated and decaffeinated coffee shifted stress and mood measures in the intervention phase. Key Findings Study type: a study of habitual coffee intake, caffeinated and decaffeinated coffee, gut microbes, …

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Extra Virgin Olive Oil Increased Occipital Brain Connectivity in Pilot fMRI Study

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Extra Virgin Olive Oil Increased Occipital Brain Connectivity in Pilot fMRI Study

TL;DR: A 2026 pilot study in Food & Function found that one month of extra virgin olive oil intake was associated with higher resting-state occipital functional connectivity than regular olive oil in 9 healthy young adults. Key Findings Occipital connectivity was the imaging endpoint: The 9-person neuroimaging substudy came from a larger randomized crossover trial …

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Oral Arginine Reduced Amyloid-Beta Pathology in Two Mouse Models of Alzheimer’s Disease

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Oral Arginine Reduced Amyloid-Beta Pathology in Two Mouse Models of Alzheimer's Disease

TL;DR: A 2025 study in Neurochemistry International from Kindai University showed that oral arginine, a naturally occurring amino acid, blocked the formation of toxic amyloid-beta aggregates in lab tests and reduced amyloid pathology in two well-established mouse models of Alzheimer’s disease — with the authors flagging that the research-grade doses and methods are not equivalent …

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Natural Daylight During Office Hours Improved Glucose Time-in-Range and Shifted Substrate Metabolism in Type 2 Diabetes

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Natural Daylight During Office Hours Improved Glucose Time-in-Range and Shifted Substrate Metabolism in Type 2 Diabetes

TL;DR: A 2026 randomized crossover trial in Cell Metabolism compared natural daylight against standard artificial office lighting in 13 older adults with well-controlled type 2 diabetes and found that natural-daylight days produced more time in a healthy blood-glucose range (about 51% vs 43%), smaller glucose swings, and a metabolic shift toward burning more fat and …

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Ex-Smokers Had Higher Food Cue Reactivity on fMRI

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Ex-Smokers Had Higher Food Cue Reactivity on fMRI

TL;DR: A 2026 medRxiv preprint found that ex-smokers had higher fMRI blood oxygen level dependent (BOLD) responses to high-energy food pictures than adults with obesity or abstinent alcohol dependence, suggesting a brain reward route for post-quitting weight gain. Key Findings 77-person fMRI comparison: Researchers compared 25 ex-smokers, 26 abstinent adults with alcohol dependence, and 26 …

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Ultra-Processed Foods Eroded Visual Attention

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Ultra-Processed Foods Eroded Visual Attention

TL;DR: A 2026 study in Alzheimer’s & Dementia: Diagnosis, Assessment & Disease Monitoring found that each 10% higher energy share from ultra-processed foods was associated with lower attention scores and higher modifiable dementia-risk scores in 2,192 dementia-free Australian adults. Key Findings A dementia-free midlife sample anchored the analysis: the Healthy Brain Project included 2,192 Australians …

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