Sugar and Health: Effects on the Body from Teeth to Brain
What sugar does to the body — covering diabetes, obesity, heart disease, cancer, liver disease, brain function, mental health, sleep, inflammation, and more.
July 3, 2026
What sugar does to the body, organ by organ and system by system. Each page covers specific mechanisms, named studies, and the numbers behind the research.
- More on Sugar and Diabetes — Type 1 vs. Type 2, the insulin resistance chain, prevention evidence, and what papers typically get wrong
- Sugar and Obesity — Liquid calories, fructose and leptin, de novo lipogenesis, visceral fat
- Sugar and Heart Disease — The 2014 Yang et al. study, triglyceride and HDL mechanisms, the industry cover-up
- Sugar and Cancer: key facts. The Warburg effect, IGF-1 pathway, what’s established vs. what’s overstated
- More on Sugar and the Liver — NAFLD spectrum, fructose metabolism, the Stanhope 2009 JCI study
- Sugar and the Brain — Glucose and cognition, the GI-sleep connection, fructose and ATP reduction
- Sugar and Mental Health. The Knüppel 2017 study, SMILES trial, BDNF reduction, neuroinflammation
- Sugar and Sleep explained. The St-Onge 2016 sleep architecture study, blood glucose at night, the feedback loop
- More on Sugar and Inflammation — AGEs, uric acid and the NLRP3 inflammasome, gut LPS pathway
- Sugar and Blood Pressure. Fructose, uric acid, eNOS inhibition, and the Te Morenga 2012 meta-analysis
- Sugar and Tooth Decay — S. mutans, acid attack timing, fluoride, the Vipeholm Study ethics
- Sugar and Kids’ Teeth, explained — Early childhood caries, sippy cup patterns, S. mutans transmission, fluoride varnish
- More on Sugar Addiction — Dopamine, Hoebel rat studies, the “cocaine comparison” origin, human evidence
- Sugar and Aging — Glycation, AGEs, collagen half-life, HbA1c, telomere research
- Sugar and Gut Health — Microbiome diversity, SCFA production, gut-brain axis
- Sugar and Skin — an overview — Acne and IGF-1, the Smith 2007 RCT, glycation and collagen
- More on Sugar and Children. The hyperactivity myth debunked, pediatric NAFLD, AAP guidelines
- Sugar and Insulin Resistance — Cellular mechanism, ceramide connection, muscle and fat cell resistance, what reverses it
- Sugar and Energy Levels — Blood glucose curve, the sugar crash meta-analysis, why exercise is different
- Sugar and Cholesterol in depth — Triglycerides, HDL erosion, small dense LDL, the AHA 2014 study
- More on Sugar and Pregnancy — Gestational diabetes, placental glucose transfer, fetal macrosomia, epigenetic effects
- Sugar and Kidney Disease. Fructose-uric acid pathway, tubulointerstitial nephritis, blood pressure and nephrons
- Sugar and Hormones. Insulin, leptin resistance, ghrelin dysregulation, cortisol-fructose interaction
- Sugar and Bone Health: key facts — Urinary calcium loss, phosphoric acid, IGF-1, epidemiological data
- More on Sugar and the Immune System — Neutrophil suppression, vitamin C competition, glycation of antibodies, COVID-19 data
- Sugar and Vision — Diabetic retinopathy, polyol pathway and cataracts, AREDS data
- Sugar and Cognitive Decline — Type 3 diabetes hypothesis, AGEs in the brain, fructose and ATP, population data
- Sugar and Anxiety explained — Blood glucose-panic connection, cortisol spikes, gut-brain axis, caffeine interaction
- More on Sugar and Autoimmune Disease — Gut permeability, Th17/Treg imbalance, NLRP3 inflammasome, what evidence doesn’t show
- Sugar and Muscle Recovery — Glycogen windows, insulin-protein synthesis, the revised anabolic window research
- Sugar and Satiety — GLP-1 vs. fructose, liquid sugar and appetite hormones, passive overconsumption
- Sugar and Chronic Disease, explained — What’s established, what’s likely, what’s overstated across all conditions
- More on Sugar and Stress — Cortisol and sweet cravings, the comfort-eating mechanism, HPA axis blunting
- Sugar and Mitochondria. Fructose ATP depletion, reactive oxygen species, uric acid in mitochondria
- Sugar and Longevity — IGF-1, mTOR and autophagy, Blue Zones diet data, telomere biology
- Sugar and Oral Health — an overview — Gum disease inflammation, salivary pH, acid attack cycle, sugar timing vs. amount
- More on Sugar and Gut Permeability — Tight junction proteins, lactulose:mannitol ratios, fructose-specific effects
- Sugar and Dopamine — Nucleus accumbens, gut glucose sensing, Hoebel rat studies, liking vs. wanting
- Sugar and Weight Management — Calorie debate, fructose and visceral fat, what controlled trials show
- Sugar in Baby Food in depth — AAP guidelines, commercial baby food data, taste preference formation, microbiome
- More on Sugar and Type 1 Diabetes — Autoimmune mechanism, how it differs from type 2, hypoglycemia as medicine
- Sugar and Fasting — Metabolic switch, ketone production, TRE research, myths about coffee and fasting
- Sugar and Epigenetics — DNA methylation, histone modification, hyperglycemic memory, intergenerational effects
- Sugar and Endothelial Function: key facts — Nitric oxide pathway, post-meal glucose spikes, fructose and uric acid’s vascular effects
- More on Sugar and Hunger Signals — Ghrelin, leptin, GLP-1, CCK, and how fructose bypasses appetite regulation
- Sugar and Metabolic Syndrome — Five diagnostic criteria, how sugar drives each, prevalence, reversal evidence
- Sugar and Taste Perception — T1R2/T1R3 receptors, supertasters, how chronic exposure changes sweetness sensitivity
- Sugar in Fruit explained — Why whole fruit behaves differently, fiber effect, juice vs. whole fruit data
- More on Sugar in Plant-Based Diet — Whole-food vs. processed vegan foods, oat milk, protein bars, metabolic data
- Sugar in Sports Nutrition. Glucose:fructose ratios, 60-90g/hr limit, carbohydrate loading, when sugar helps