---
title: "Mega Studies | Mike Sinn"
description: "50,000+ causal inference studies on what actually helps with disease, generated from real-world health data."
url: https://mikesinn.com/mega-studies
---

# Mega Studies

Browse thousands of health variables with data from millions of measurements. Find out what actually affects your health instead of just guessing.

3.0K variables tracked

Filter by category

All categoriesEmotionsPhysiqueSleepSymptomsTreatmentsFoodsEnvironmentVital Signs

Showing 3,049 variables

[Emotions — Overall Mood — Your mood is the way you are feeling at a particular time. If you are in a good mood, you feel cheerful. If you are in a bad mood, you feel angry and impatient. ... If someone is in a mood, the way they are behaving shows that they are feeling angry and impatient. — 9.1K participants7.1K studies617.1K measurements — View studies](https://studies.dfda.earth/variables/Overall%5FMood/) [Emotions — Outcome — Irritability — Easily annoyed or provoked — 2.2K participants2.2K studies48.8K measurements — View studies](https://studies.dfda.earth/variables/Irritability/) [Emotions — Outcome — Nervousness — Frightened or worried about something that is happening or might happen. — 1.8K participants1.5K studies37.2K measurements — View studies](https://studies.dfda.earth/variables/Nervousness/) [Emotions — Outcome — Guiltiness — Guilt is an unhappy feeling that you have because you have done something wrong or think that you have done something wrong. — 1.8K participants2.3K studies31.6K measurements — View studies](https://studies.dfda.earth/variables/Guiltiness/) [Emotions — Outcome — Fear — 1115 studies on Fear — 1.7K participants1.1K studies22.9K measurements — View studies](https://studies.dfda.earth/variables/Fear/) [Emotions — Outcome — Alertness — If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen. — 1.6K participants1.4K studies26.0K measurements — View studies](https://studies.dfda.earth/variables/Alertness/) [Emotions — Outcome — Excitability — If you describe someone as excitable, you mean that they behave in a nervous way and become excited very easily. — 1.6K participants1.2K studies25.9K measurements — View studies](https://studies.dfda.earth/variables/Excitability/) [Emotions — Outcome — Shame — A painful feeling of humiliation or distress caused by the consciousness of wrong or foolish behavior. — 1.5K participants1.0K studies20.7K measurements — View studies](https://studies.dfda.earth/variables/Shame/) [Emotions — Outcome — Activeness — Someone who is active moves around a lot or does a lot of things. — 1.5K participants1.3K studies30.7K measurements — View studies](https://studies.dfda.earth/variables/Activeness/) [Emotions — Outcome — Enthusiasm — Enthusiasm is great eagerness to be involved in a particular activity that you like and enjoy or that you think is important. — 1.5K participants1.3K studies24.2K measurements — View studies](https://studies.dfda.earth/variables/Enthusiasm/) [Emotions — Outcome — Distress — 1349 studies on Distress — 1.5K participants1.3K studies33.1K measurements — View studies](https://studies.dfda.earth/variables/Distress/) [Emotions — Outcome — Attentiveness — 1093 studies on Attentiveness — 1.5K participants1.1K studies20.5K measurements — View studies](https://studies.dfda.earth/variables/Attentiveness/) [Emotions — Outcome — Hostility — 1794 studies on Hostility — 1.5K participants1.8K studies24.3K measurements — View studies](https://studies.dfda.earth/variables/Hostility/) [Emotions — Outcome — Upsettedness — 1127 studies on Upsettedness — 1.4K participants1.1K studies32.7K measurements — View studies](https://studies.dfda.earth/variables/Upsettedness/) [Emotions — Outcome — Interest — 1116 studies on Interest — 1.4K participants1.1K studies22.5K measurements — View studies](https://studies.dfda.earth/variables/Interest/) [Emotions — Outcome — Jitteriness — 1226 studies on Jitteriness — 1.4K participants1.2K studies28.2K measurements — View studies](https://studies.dfda.earth/variables/Jitteriness/) [Emotions — Outcome — Determination — 1197 studies on Determination — 1.4K participants1.2K studies20.8K measurements — View studies](https://studies.dfda.earth/variables/Determination/) [Emotions — Outcome — Inspiration — 1050 studies on Inspiration — 1.3K participants1.1K studies21.8K measurements — View studies](https://studies.dfda.earth/variables/Inspiration/) [Emotions — Outcome — Resilience — 1180 studies on Resilience — 1.3K participants1.2K studies25.3K measurements — View studies](https://studies.dfda.earth/variables/Resilience/) [Emotions — Outcome — Scaredness — 1066 studies on Scaredness — 1.3K participants1.1K studies19.6K measurements — View studies](https://studies.dfda.earth/variables/Scaredness/) [Emotions — Outcome — Pride — 999 studies on Pride — 1.3K participants999 studies21.5K measurements — View studies](https://studies.dfda.earth/variables/Pride/) [Symptoms — Outcome — Tiredness / Fatigue — 1606 studies on Tiredness / Fatigue — 1.2K participants1.6K studies8.6K measurements — View studies](https://studies.dfda.earth/variables/Tiredness%5F%2F%5FFatigue/) [Environment — Barometric Pressure — 488 studies on Barometric Pressure — 1.1K participants488 studies2.8K measurements — View studies](https://studies.dfda.earth/variables/Barometric%5FPressure/) [Environment — Cloud Cover — 403 studies on Cloud Cover — 1.1K participants403 studies1.8K measurements — View studies](https://studies.dfda.earth/variables/Cloud%5FCover/) [Environment — Outdoor Humidity — 493 studies on Outdoor Humidity — 1.0K participants493 studies406.4K measurements — View studies](https://studies.dfda.earth/variables/Outdoor%5FHumidity/) [Environment — UV Index — 595 studies on UV Index — 1.0K participants595 studies2.8K measurements — View studies](https://studies.dfda.earth/variables/UV%5FIndex/) [Emotions — Outcome — Anxiety — 1826 studies on Anxiety — 998 participants1.8K studies13.5K measurements — View studies](https://studies.dfda.earth/variables/Anxiety/) [Environment — Outdoor Temperature — 454 studies on Outdoor Temperature — 927 participants454 studies312.5K measurements — View studies](https://studies.dfda.earth/variables/Outdoor%5FTemperature/) [Environment — Time Between Sunrise And Sunset — 362 studies on Time Between Sunrise And Sunset — 817 participants362 studies821.6K measurements — View studies](https://studies.dfda.earth/variables/Time%5FBetween%5FSunrise%5FAnd%5FSunset/) [Symptoms — Outcome — Lack of Motivation — 870 studies on Lack of Motivation — 746 participants870 studies3.9K measurements — View studies](https://studies.dfda.earth/variables/Lack%5Fof%5FMotivation/) [Foods — Coffee, Tea & Cocoa — 302 studies on Coffee, Tea & Cocoa — 712 participants302 studies230 measurements — View studies](https://studies.dfda.earth/variables/Coffee%2C%5FTea%5F%26%5FCocoa/) [Environment — Daily High Outdoor Temperature — 112 studies on Daily High Outdoor Temperature — 708 participants112 studies22.3K measurements — View studies](https://studies.dfda.earth/variables/Daily%5FHigh%5FOutdoor%5FTemperature/) [Environment — Precipitation — 428 studies on Precipitation — 698 participants428 studies396.5K measurements — View studies](https://studies.dfda.earth/variables/Precipitation/) [Environment — Wind Speed — 146 studies on Wind Speed — 666 participants146 studies95.1K measurements — View studies](https://studies.dfda.earth/variables/Wind%5FSpeed/) [Environment — Average Daily Outdoor Temperature — 107 studies on Average Daily Outdoor Temperature — 658 participants107 studies95.0K measurements — View studies](https://studies.dfda.earth/variables/Average%5FDaily%5FOutdoor%5FTemperature/) [Environment — Daily Low Outdoor Temperature — 108 studies on Daily Low Outdoor Temperature — 658 participants108 studies95.0K measurements — View studies](https://studies.dfda.earth/variables/Daily%5FLow%5FOutdoor%5FTemperature/) [Foods — Water (mL) — 228 studies on Water (mL) — 656 participants228 studies58.3K measurements — View studies](https://studies.dfda.earth/variables/Water%5F%28mL%29/) [Foods — Single-Serve Capsules & Pods — 300 studies on Single-Serve Capsules & Pods — 596 participants300 studies10 measurements — View studies](https://studies.dfda.earth/variables/Single-Serve%5FCapsules%5F%26%5FPods/) [Foods — Coffee — 326 studies on Coffee — 559 participants326 studies4.7K measurements — View studies](https://studies.dfda.earth/variables/Coffee/) [Symptoms — Outcome — Insomnia Or Sleep Disturbances — 786 studies on Insomnia Or Sleep Disturbances — 527 participants786 studies2.2K measurements — View studies](https://studies.dfda.earth/variables/Insomnia%5FOr%5FSleep%5FDisturbances/) [Emotions — Outcome — Stress — 1265 studies on Stress — 484 participants1.3K studies4.0K measurements — View studies](https://studies.dfda.earth/variables/Stress/) [Social Interactions — Outcome — Facebook Pages Liked — 916 studies on Facebook Pages Liked — 461 participants916 studies164.3K measurements — View studies](https://studies.dfda.earth/variables/Facebook%5FPages%5FLiked/) [Emotions — Outcome — Energy — 2158 studies on Energy — 458 participants2.2K studies8.1K measurements — View studies](https://studies.dfda.earth/variables/Energy/) [Physique — Outcome — Body Weight — 1140 studies on Body Weight — 417 participants1.1K studies108.8K measurements — View studies](https://studies.dfda.earth/variables/Body%5FWeight/) [Symptoms — Outcome — Back Pain — negative — 405 participants1.3K studies3.7K measurements — View studies](https://studies.dfda.earth/variables/Back%5FPain/) [Emotions — Outcome — Loneliness — 604 studies on Loneliness — 404 participants604 studies3.4K measurements — View studies](https://studies.dfda.earth/variables/Loneliness/) [Sleep — Outcome — Sleep Duration — 3379 studies on Sleep Duration — 404 participants3.4K studies43.1K measurements — View studies](https://studies.dfda.earth/variables/Sleep%5FDuration/) [Physical Activity — Outcome — Calories Burned — 878 studies on Calories Burned — 393 participants878 studies122.9K measurements — View studies](https://studies.dfda.earth/variables/Calories%5FBurned/) [Physical Activity — Outcome — Walk Or Run Distance — 891 studies on Walk Or Run Distance — 378 participants891 studies123.1K measurements — View studies](https://studies.dfda.earth/variables/Walk%5FOr%5FRun%5FDistance/) [Symptoms — Outcome — Headache Severity — 1498 studies on Headache Severity — 351 participants1.5K studies5.4K measurements — View studies](https://studies.dfda.earth/variables/Headache%5FSeverity/) [Environment — Precipitation (Volume) — 8 studies on Precipitation (Volume) — 293 participants8 studies9.3K measurements — View studies](https://studies.dfda.earth/variables/Precipitation%5F%28Volume%29/) [Environment — Cloud Cover Amount — 231 studies on Cloud Cover Amount — 284 participants231 studies171.8K measurements — View studies](https://studies.dfda.earth/variables/Cloud%5FCover%5FAmount/) [Physical Activity — Outcome — Daily Step Count — 331 studies on Daily Step Count — 280 participants331 studies88.0K measurements — View studies](https://studies.dfda.earth/variables/Daily%5FStep%5FCount/) [Environment — Fine Particulate Matter Pollution Air Quality Index — 354 studies on Fine Particulate Matter Pollution Air Quality Index — 272 participants354 studies2.2K measurements — View studies](https://studies.dfda.earth/variables/Fine%5FParticulate%5FMatter%5FPollution%5FAir%5FQuality%5FIndex/) [Emotions — Outcome — Social Anxiety — 508 studies on Social Anxiety — 264 participants508 studies1.5K measurements — View studies](https://studies.dfda.earth/variables/Social%5FAnxiety/) [Environment — Partly Cloudy-day — 291 studies on Partly Cloudy-day — 257 participants291 studies1.7K measurements — View studies](https://studies.dfda.earth/variables/Partly%5FCloudy-day/) [Environment — Ozone Pollution Air Quality Index — 357 studies on Ozone Pollution Air Quality Index — 249 participants357 studies1.9K measurements — View studies](https://studies.dfda.earth/variables/Ozone%5FPollution%5FAir%5FQuality%5FIndex/) [Social Interactions — Outcome — Facebook Posts — 909 studies on Facebook Posts — 249 participants909 studies260.5K measurements — View studies](https://studies.dfda.earth/variables/Facebook%5FPosts/) [Environment — Pollen Index — 179 studies on Pollen Index — 240 participants179 studies96.8K measurements — View studies](https://studies.dfda.earth/variables/Pollen%5FIndex/) [Treatments — Meditation — 209 studies on Meditation — 228 participants209 studies2.5K measurements — View studies](https://studies.dfda.earth/variables/Meditation/) [Emotions — Outcome — Anger — 847 studies on Anger — 227 participants847 studies1.9K measurements — View studies](https://studies.dfda.earth/variables/Anger/) [Vital Signs — Outcome — Heart Rate (Pulse) — 1784 studies on Heart Rate (Pulse) — 225 participants1.8K studies44.8K measurements — View studies](https://studies.dfda.earth/variables/Heart%5FRate%5F%28Pulse%29/) [Nutrients — Protein — 355 studies on Protein — 224 participants355 studies6.0K measurements — View studies](https://studies.dfda.earth/variables/Protein/) [Foods — Water (serving) — 155 studies on Water (serving) — 214 participants155 studies1.1K measurements — View studies](https://studies.dfda.earth/variables/Water%5F%28serving%29/) [Environment — Juniper Pollen Index — 51 studies on Juniper Pollen Index — 205 participants51 studies13.6K measurements — View studies](https://studies.dfda.earth/variables/Juniper%5FPollen%5FIndex/) [Physique — Outcome — Body Mass Index Or BMI — 2692 studies on Body Mass Index Or BMI — 201 participants2.7K studies5.6K measurements — View studies](https://studies.dfda.earth/variables/Body%5FMass%5FIndex%5FOr%5FBMI/) [Environment — Grasses Pollen Index — 119 studies on Grasses Pollen Index — 201 participants119 studies21.8K measurements — View studies](https://studies.dfda.earth/variables/Grasses%5FPollen%5FIndex/) [Environment — Rain — 284 studies on Rain — 196 participants284 studies995 measurements — View studies](https://studies.dfda.earth/variables/Rain/) [Environment — Outdoor Visibility — 41 studies on Outdoor Visibility — 194 participants41 studies479 measurements — View studies](https://studies.dfda.earth/variables/Outdoor%5FVisibility/) [Symptoms — Outcome — Sleepiness — 304 studies on Sleepiness — 191 participants304 studies787 measurements — View studies](https://studies.dfda.earth/variables/Sleepiness/) [Symptoms — Outcome — Panic Attack — 366 studies on Panic Attack — 189 participants366 studies5.0K measurements — View studies](https://studies.dfda.earth/variables/Panic%5FAttack/) [Sleep — Outcome — Awakenings — 1643 studies on Awakenings — 188 participants1.6K studies33.7K measurements — View studies](https://studies.dfda.earth/variables/Awakenings/) [Nutrients — Cholesterol — 113 studies on Cholesterol — 188 participants113 studies20.6K measurements — View studies](https://studies.dfda.earth/variables/Cholesterol/) [Environment — Elm Pollen Index — 49 studies on Elm Pollen Index — 186 participants49 studies9.5K measurements — View studies](https://studies.dfda.earth/variables/Elm%5FPollen%5FIndex/) [Symptoms — Outcome — ADHD — 384 studies on ADHD — 180 participants384 studies456 measurements — View studies](https://studies.dfda.earth/variables/ADHD/) [Nutrients — Caloric Intake — 168 studies on Caloric Intake — 178 participants168 studies17.1K measurements — View studies](https://studies.dfda.earth/variables/Caloric%5FIntake/) [Symptoms — Outcome — Neck Pain — 484 studies on Neck Pain — 177 participants484 studies1.7K measurements — View studies](https://studies.dfda.earth/variables/Neck%5FPain/) [Environment — Ragweed Pollen Index — 106 studies on Ragweed Pollen Index — 176 participants106 studies19.9K measurements — View studies](https://studies.dfda.earth/variables/Ragweed%5FPollen%5FIndex/) [Symptoms — Outcome — Hunger — Desire to eat — 176 participants1.2K studies2.1K measurements — View studies](https://studies.dfda.earth/variables/Hunger/) [Sleep — Outcome — Sleep Start Time — 2517 studies on Sleep Start Time — 175 participants2.5K studies5.6K measurements — View studies](https://studies.dfda.earth/variables/Sleep%5FStart%5FTime/) [Environment — Oak Pollen Index — 33 studies on Oak Pollen Index — 174 participants33 studies11.9K measurements — View studies](https://studies.dfda.earth/variables/Oak%5FPollen%5FIndex/) [Symptoms — Outcome — Suicidality — 451 studies on Suicidality — 170 participants451 studies886 measurements — View studies](https://studies.dfda.earth/variables/Suicidality/) [Symptoms — Outcome — Fatigue / Lethargy / Tiredness — 458 studies on Fatigue / Lethargy / Tiredness — 168 participants458 studies1.1K measurements — View studies](https://studies.dfda.earth/variables/Fatigue%5F%2F%5FLethargy%5F%2F%5FTiredness/) [Environment — Clear Day — 228 studies on Clear Day — 164 participants228 studies825 measurements — View studies](https://studies.dfda.earth/variables/Clear%5FDay/) [Environment — Chenopods Pollen Index — 102 studies on Chenopods Pollen Index — 158 participants102 studies18.4K measurements — View studies](https://studies.dfda.earth/variables/Chenopods%5FPollen%5FIndex/) [Symptoms — Outcome — Acne Severity — 1507 studies on Acne Severity — 156 participants1.5K studies2.8K measurements — View studies](https://studies.dfda.earth/variables/Acne%5FSeverity/) [Environment — Air Quality Index — 229 studies on Air Quality Index — 156 participants229 studies131.5K measurements — View studies](https://studies.dfda.earth/variables/Air%5FQuality%5FIndex/) [Social Interactions — Outcome — Facebook Posts Made — 417 studies on Facebook Posts Made — 151 participants417 studies85.0K measurements — View studies](https://studies.dfda.earth/variables/Facebook%5FPosts%5FMade/) [Physical Activity — Outcome — Hourly Step Count — 304 studies on Hourly Step Count — 151 participants304 studies123.4K measurements — View studies](https://studies.dfda.earth/variables/Hourly%5FStep%5FCount/) [Environment — Ozone Pollution Air Quality — 22 studies on Ozone Pollution Air Quality — 150 participants22 studies5.2K measurements — View studies](https://studies.dfda.earth/variables/Ozone%5FPollution%5FAir%5FQuality/) [Foods — Tea - Brewed, Prepared With Tap Water (black Tea) — 157 studies on Tea - Brewed, Prepared With Tap Water (black Tea) — 150 participants157 studies925 measurements — View studies](https://studies.dfda.earth/variables/Tea%5F-%5FBrewed%2C%5FPrepared%5FWith%5FTap%5FWater%5F%28black%5FTea%29/) [Environment — Fine Particulate Matter Pollution Air Quality — 22 studies on Fine Particulate Matter Pollution Air Quality — 149 participants22 studies5.9K measurements — View studies](https://studies.dfda.earth/variables/Fine%5FParticulate%5FMatter%5FPollution%5FAir%5FQuality/) [Vital Signs — Outcome — Resting Heart Rate (Pulse) — 2576 studies on Resting Heart Rate (Pulse) — 148 participants2.6K studies3.7K measurements — View studies](https://studies.dfda.earth/variables/Resting%5FHeart%5FRate%5F%28Pulse%29/) [Sleep — Outcome — Sleep Efficiency — 1854 studies on Sleep Efficiency — 147 participants1.9K studies22.6K measurements — View studies](https://studies.dfda.earth/variables/Sleep%5FEfficiency/) [Environment — Partly Cloudy-night — 227 studies on Partly Cloudy-night — 146 participants227 studies741 measurements — View studies](https://studies.dfda.earth/variables/Partly%5FCloudy-night/) [Symptoms — Outcome — Dissociation — 298 studies on Dissociation — 146 participants298 studies836 measurements — View studies](https://studies.dfda.earth/variables/Dissociation/) [Symptoms — Outcome — Apathy — 224 studies on Apathy — 141 participants224 studies793 measurements — View studies](https://studies.dfda.earth/variables/Apathy/) [Environment — Ash Pollen Index — 32 studies on Ash Pollen Index — 140 participants32 studies4.1K measurements — View studies](https://studies.dfda.earth/variables/Ash%5FPollen%5FIndex/) [Environment — Mulberry Pollen Index — 21 studies on Mulberry Pollen Index — 138 participants21 studies7.7K measurements — View studies](https://studies.dfda.earth/variables/Mulberry%5FPollen%5FIndex/) [Foods — Caffeine — 65 studies on Caffeine — 137 participants65 studies208 measurements — View studies](https://studies.dfda.earth/variables/Caffeine/) 

Showing first 100 of 3,049 results. Use search to narrow down.

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