The Healthspan Map · Endocrine & Metabolic
Obesity / weight gain
Named for Obesity / weight gain
| Nutrient or lever | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Cardio (moderate + intervals) | Do this | Strong | RCT / meta-analysis | Aerobic exercise ranks best for reducing body weight and BMI in overweight/obesity; HIIT is best for waist circumference. | Exercise-obesity NMA (opens in a new tab) |
| Sleep duration | Watch this | Strong | RCT / meta-analysis | Short sleep raises obesity risk via lower leptin and higher ghrelin; about 1 h more sleep links to ~0.35 kg/m2 lower BMI. | Short sleep & central obesity meta (opens in a new tab) |
| Strength (resistance) | Do this | Strong | RCT / meta-analysis | Resistance training lowers body-fat percentage and fat mass and best preserves/builds lean mass (raising resting metabolic rate); combined with aerobic is optimal. | Resistance training & body-composition meta (opens in a new tab) |
| Sugary drinks & snacks — cut back | Do this | Strong | RCT / meta-analysis | Adding sugar-sweetened beverages caused +0.83 kg and removing them -0.49 kg, with a dose-response link to higher BMI and body weight. | SSB & weight meta (AJCN 2023) (opens in a new tab) |
| Ultra-processed food — cut back | Do this | Strong | RCT / trial | An ultra-processed diet drove ~508 kcal/day more intake and weight gain vs a matched unprocessed diet; limiting ultra-processed foods helps prevent and treat obesity. | Hall et al. 2019, Cell Metabolism (opens in a new tab) |
| Added Sugars | Don't overdo | Moderate | RCT / meta-analysis | Excess added sugar, especially in liquid form, promotes weight gain through low satiety and incomplete calorie compensation. | SSB & weight meta (AJCN 2023) (opens in a new tab) |
| Alcohol — cut back | Do this | Moderate | RCT / meta-analysis | Heavy alcohol intake is associated with general and abdominal obesity (empty calories); light-moderate intake is inconsistent. | Alcohol & obesity meta (opens in a new tab) |
| Anchor foods | Watch this | Moderate | Review / narrative | Building meals around protein and fibre raises satiety hormones and diet-induced thermogenesis, curbing overall intake. | High-protein diet weight-loss review (opens in a new tab) |
| Carbohydrate | Don't overdo | Moderate | RCT / meta-analysis | Cutting refined/high-glycaemic carbohydrate lowers calorie intake and drives weight loss (low-carb diets reduce weight and BMI, especially short-term). Whole-food carbohydrates (vegetables, legumes, whole grains, fruit) are not the driver - refinement and total load are. | Low-carbohydrate diet weight-loss meta (Silverii 2022) (opens in a new tab) |
| Cook real food | Do this | Moderate | RCT / trial | Cooking minimally-processed meals lowers energy density and eating rate, reducing calorie intake compared with ultra-processed food. | Hall et al. 2019, Cell Metabolism (opens in a new tab) |
| Daily movement baseline | Do this | Moderate | RCT / meta-analysis | More everyday movement (NEAT) raises daily energy expenditure; adding activity to eating changes optimizes fat loss while sparing lean mass. | Exercise + caloric-restriction body-composition NMA (opens in a new tab) |
| Movement (breaking up sitting) | Do this | Moderate | Systematic review | Prolonged sitting relates to higher BMI; frequent breaks from sitting are linked to a more favourable body weight. | Sedentary behaviour & obesity review (opens in a new tab) |
| Protein | Eat enough of | Moderate | RCT / meta-analysis | Higher protein intake boosts satiety and diet-induced thermogenesis and preserves lean mass/resting metabolic rate, aiding weight loss and preventing regain. | High-protein diet weight-loss review (Wycherley meta) (opens in a new tab) |
| Saturated fat | Don't overdo | Moderate | RCT / trial | Energy-dense, saturated-fat-rich (often ultra-processed) foods drive excess calorie intake and weight gain. | Hall et al. 2019, Cell Metabolism (opens in a new tab) |
| Screens before bed — cut back | Do this | Moderate | RCT / trial | Genetic liability to TV and leisure screen time causally raises obesity risk (TV OR 1.55; leisure screen OR 1.62). | Sedentary behaviour & obesity MR (opens in a new tab) |
| Sleep regularity | Watch this | Moderate | RCT / meta-analysis | Irregular sleep timing / social jetlag is associated with ~23% higher odds of overweight/obesity via circadian misalignment. | "Association Between Social Jetlag and Components of Metabolic Syndrome: A Systematic Review and Meta-Analysis", 2024 (opens in a new tab) |
| Total Fiber | Eat enough of | Moderate | RCT / trial | High-fibre, minimally-processed diets promote satiety (PYY/GLP-1), lower energy density, and produce weight and fat loss. | High-fibre vs high-protein weight-loss trial (Te Morenga 2011) (opens in a new tab) |
| Total Sugars | Don't overdo | Moderate | RCT / meta-analysis | High free/added-sugar intake, especially from drinks and sweets, promotes weight gain; the intrinsic sugars in whole fruit and dairy are not implicated. | SSB & weight meta (AJCN 2023) (opens in a new tab) |
| Water / hydration | Do this | Moderate | RCT / meta-analysis | Replacing sugary drinks with water (or a pre-meal water load) lowers energy intake and supports weight loss. | SSB-to-water substitution meta (opens in a new tab) |
| Calcium | Eat enough of | Emerging | RCT / meta-analysis | Dietary calcium, mainly from dairy, may modestly support fat oxidation and weight regulation; evidence is mixed. | Food groups & obesity dose-response meta (opens in a new tab) |
| Colours a day | Watch this | Emerging | RCT / meta-analysis | Higher fruit and vegetable intake is modestly associated with less weight gain and lower adiposity risk (low energy density, satiety). | Fruit & vegetable intake & weight meta (opens in a new tab) |
| Total Fat | Don't overdo | Emerging | RCT / trial | Fat is the most energy-dense macronutrient, so fat-rich (often ultra-processed) foods ease overeating; total fat itself is not uniquely fattening - saturated/trans fat and processing matter more. | Hall et al. 2019, Cell Metabolism (opens in a new tab) |
Held for the whole Endocrine & Metabolic system
These rows name no single condition. The Map records them against the whole body system, so they are shown separately rather than folded in.
| Nutrient or lever | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| BMI | Watch this | Strong | Established clinical | High BMI drives the metabolic-endocrine cluster: insulin resistance, T2D, dyslipidemia, PCOS. | Obesity clinical review (opens in a new tab) |
| BMI | Watch this | Strong | RCT / meta-analysis | BMI discriminates the cardiometabolic-risk cluster across >300,000 adults. | Ashwell et al., Obesity Reviews 2012 (opens in a new tab) |
| Movement (breaking up sitting) | Do this | Strong | RCT / meta-analysis | Sedentary behaviour independently worsens glucose and lipid metabolism and raises type 2 diabetes risk. | Patterson et al., Eur J Epidemiol 2018 (meta-analysis) (opens in a new tab) |
| Movement (breaking up sitting) | Do this | Strong | RCT / meta-analysis | Regular movement breaks improve glycemic and metabolic regulation. | Breaking-up-sitting experimental studies (opens in a new tab) |
| Sleep duration | Watch this | Strong | RCT / meta-analysis | Sleep duration has a U-shaped link with type 2 diabetes; risk is lowest at 7-8 h and rises for both short and long sleep. | Shan et al., Diabetes Care 2015 (meta-analysis) (opens in a new tab) |
| Sleep duration | Watch this | Strong | Cohort / observational | Sleeping <6 h vs 7 h raised incident type 2 diabetes risk by ~30%, independent of baseline health. | 45 and Up Study + meta-analysis (n=447,124) (opens in a new tab) |
| Vitamin D | Don't overdo | Strong | Established clinical | Toxicity (almost always from supplements, UL 100 mcg/4,000 IU) causes hypercalcemia and hypercalciuria. | NIH ODS / MedlinePlus (Hypervitaminosis D) (opens in a new tab) |
| Vitamin D | Don't overdo | Strong | Established clinical | Toxicity (almost always from supplements, UL 100 mcg/4,000 IU) causes hypercalcemia and hypercalciuria. | NIH Office of Dietary Supplements — Vitamin D (opens in a new tab) |
| Waist-to-height ratio | Watch this | Strong | RCT / meta-analysis | WHtR had the greatest discriminatory power for the cardiometabolic-risk cluster. | Ashwell et al., Obesity Reviews 2012 (>300,000 adults) (opens in a new tab) |
| Body Roundness Index | Watch this | Moderate | Cohort / observational | Higher BRI reflects visceral adiposity and cardiometabolic risk. | "Body Roundness Index Associated With Cardiometabolic Multimorbidity and Mortality: A Multistate Analysis", Obesity 2025 (opens in a new tab) |
| Cardio / VO2max | Watch this | Moderate | RCT / meta-analysis | Low CRF predicts incident type 2 diabetes and metabolic disease. | Lang et al., BJSM 2024 (opens in a new tab) |
| Chloride | Eat enough of | Moderate | Established clinical | Chloride depletion (from vomiting, diuretics, NG suction) causes metabolic alkalosis and, secondarily, hypokalemia; low dietary intake is uncommon. | NIH Clinical Methods – Serum Chloride (opens in a new tab) |
| Chloride | Don't overdo | Moderate | Established clinical | Hyperchloremia (from dehydration, excess saline, renal dysfunction) causes hyperchloremic metabolic acidosis. | Critical-care chloride review (PMC10995984) (opens in a new tab) |
| Consistency (the weekly dose) | Do this | Moderate | RCT / meta-analysis | Strengthening activity improves insulin sensitivity and lowers diabetes/metabolic risk. | Momma et al., BJSM 2022 (opens in a new tab) |
| Phosphorus | Don't overdo | Moderate | Mechanistic | Excess phosphate alters the hormones regulating calcium (PTH, FGF-23, vitamin D), causing secondary hyperparathyroidism and hypocalcemia. | NIH ODS – Phosphorus (opens in a new tab) |
| Sleep regularity | Watch this | Moderate | Cohort / observational | Irregular sleep-wake timing is associated with metabolic abnormalities and glycemic dysregulation. | Sleep-regularity and metabolic literature (MESA; UK Biobank) (opens in a new tab) |
| Waist-to-hip ratio | Watch this | Moderate | Cohort / observational | High waist-to-hip ratio reflects visceral fat and cardiometabolic risk. | Central-adiposity literature (opens in a new tab) |
| Vitamin A (RAE) | Don't overdo | Emerging | Established clinical | Prolonged high-dose vitamin A can cause hypercalcemia. | Case series (PMC10185110) (opens in a new tab) |