{
  "name": "stress-load-index",
  "title": "SnapStress Stress-Load Index",
  "version": "0.1.0",
  "updated": "2026-10-09",
  "license": "CC BY 4.0 (our layer: selection, servings, rounding, the bedtime model). USDA FoodData Central values are public domain (CC0 1.0).",
  "caffeine_half_life": {
    "hours": 5,
    "range_hours": [
      1.5,
      9.5
    ],
    "quote": "The mean half-life of caffeine in plasma of healthy individuals is about 5 hours. However, caffeine's elimination half-life may range between 1.5 and 9.5 hours",
    "source": {
      "name": "Institute of Medicine (US) Committee on Military Nutrition Research. Caffeine for the Sustainment of Mental Task Performance: Formulations for Military Operations. Washington (DC): National Academies Press (US); 2001. Chapter 2, Pharmacology of Caffeine.",
      "url": "https://www.ncbi.nlm.nih.gov/books/NBK223808/",
      "accessed": "2026-10-09"
    }
  },
  "omitted": [
    {
      "id": "phone-screen-night",
      "reason": "No primary source read for this release states a quantity (a dose of light and a measured effect) that the index could carry per row; the row stays out until one does (HEALTH-TRIO-DAY B2 rule)."
    }
  ],
  "rows": [
    {
      "id": "coffee",
      "lens_label": "drink:coffee",
      "name": "Coffee, brewed",
      "serving": "1 cup (8 fl oz, 237 g)",
      "serving_g": 237,
      "caffeine_mg": 95,
      "alcohol_g": 0,
      "fdc": {
        "id": 171890,
        "dataset": "SR Legacy",
        "description": "Beverages, coffee, brewed, prepared with tap water",
        "per100g": {
          "caffeine_mg": 40,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/171890/nutrients",
          "name": "USDA FoodData Central, SR Legacy 171890: Beverages, coffee, brewed, prepared with tap water",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "espresso",
      "lens_label": "drink:espresso",
      "name": "Espresso",
      "serving": "1 shot (1 fl oz, 29.6 g)",
      "serving_g": 29.6,
      "caffeine_mg": 63,
      "alcohol_g": 0,
      "fdc": {
        "id": 171891,
        "dataset": "SR Legacy",
        "description": "Beverages, coffee, brewed, espresso, restaurant-prepared",
        "per100g": {
          "caffeine_mg": 212,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/171891/nutrients",
          "name": "USDA FoodData Central, SR Legacy 171891: Beverages, coffee, brewed, espresso, restaurant-prepared",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "black-tea",
      "lens_label": null,
      "name": "Black tea, brewed",
      "serving": "1 cup (8 fl oz, 237 g)",
      "serving_g": 237,
      "caffeine_mg": 47,
      "alcohol_g": 0,
      "fdc": {
        "id": 173227,
        "dataset": "SR Legacy",
        "description": "Beverages, tea, black, brewed, prepared with tap water",
        "per100g": {
          "caffeine_mg": 20,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/173227/nutrients",
          "name": "USDA FoodData Central, SR Legacy 173227: Beverages, tea, black, brewed, prepared with tap water",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "green-tea",
      "lens_label": null,
      "name": "Green tea, brewed",
      "serving": "1 cup (245 g)",
      "serving_g": 245,
      "caffeine_mg": 29,
      "alcohol_g": 0,
      "fdc": {
        "id": 171917,
        "dataset": "SR Legacy",
        "description": "Beverages, tea, green, brewed, regular",
        "per100g": {
          "caffeine_mg": 12,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/171917/nutrients",
          "name": "USDA FoodData Central, SR Legacy 171917: Beverages, tea, green, brewed, regular",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "cola",
      "lens_label": "drink:cola",
      "name": "Cola",
      "serving": "1 can (12 fl oz, 370 g)",
      "serving_g": 370,
      "caffeine_mg": 33,
      "alcohol_g": 0,
      "fdc": {
        "id": 174852,
        "dataset": "SR Legacy",
        "description": "Beverages, carbonated, cola, regular",
        "per100g": {
          "caffeine_mg": 9,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/174852/nutrients",
          "name": "USDA FoodData Central, SR Legacy 174852: Beverages, carbonated, cola, regular",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "energy-drink",
      "lens_label": "drink:energy-drink",
      "name": "Energy drink",
      "serving": "8 fl oz (240 g)",
      "serving_g": 240,
      "caffeine_mg": 91,
      "alcohol_g": 0,
      "fdc": {
        "id": 174821,
        "dataset": "SR Legacy",
        "description": "Beverages, Energy Drink with carbonated water and high fructose corn syrup",
        "per100g": {
          "caffeine_mg": 38,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/174821/nutrients",
          "name": "USDA FoodData Central, SR Legacy 174821: Beverages, Energy Drink with carbonated water and high fructose corn syrup",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "dark-chocolate",
      "lens_label": null,
      "name": "Dark chocolate, 70–85% cacao",
      "serving": "1 oz (28.35 g)",
      "serving_g": 28.35,
      "caffeine_mg": 23,
      "alcohol_g": 0,
      "fdc": {
        "id": 170273,
        "dataset": "SR Legacy",
        "description": "Chocolate, dark, 70-85% cacao solids",
        "per100g": {
          "caffeine_mg": 80,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/170273/nutrients",
          "name": "USDA FoodData Central, SR Legacy 170273: Chocolate, dark, 70-85% cacao solids",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "milk-chocolate",
      "lens_label": "food:chocolate-bar",
      "name": "Milk chocolate bar",
      "serving": "1 bar (1.55 oz, 44 g)",
      "serving_g": 44,
      "caffeine_mg": 9,
      "alcohol_g": 0,
      "fdc": {
        "id": 167587,
        "dataset": "SR Legacy",
        "description": "Candies, milk chocolate",
        "per100g": {
          "caffeine_mg": 20,
          "alcohol_g": 0
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/167587/nutrients",
          "name": "USDA FoodData Central, SR Legacy 167587: Candies, milk chocolate",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "wine",
      "lens_label": "drink:wine",
      "name": "Wine, table",
      "serving": "1 glass (5 fl oz, 148 g)",
      "serving_g": 148,
      "caffeine_mg": 0,
      "alcohol_g": 15.4,
      "fdc": {
        "id": 173185,
        "dataset": "SR Legacy",
        "description": "Alcoholic beverage, wine, table, all",
        "per100g": {
          "caffeine_mg": 0,
          "alcohol_g": 10.4
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/173185/nutrients",
          "name": "USDA FoodData Central, SR Legacy 173185: Alcoholic beverage, wine, table, all",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "beer",
      "lens_label": "drink:beer",
      "name": "Beer, regular",
      "serving": "1 can (12 fl oz, 356 g)",
      "serving_g": 356,
      "caffeine_mg": 0,
      "alcohol_g": 13.9,
      "fdc": {
        "id": 168746,
        "dataset": "SR Legacy",
        "description": "Alcoholic beverage, beer, regular, all",
        "per100g": {
          "caffeine_mg": 0,
          "alcohol_g": 3.9
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/168746/nutrients",
          "name": "USDA FoodData Central, SR Legacy 168746: Alcoholic beverage, beer, regular, all",
          "accessed": "2026-10-09"
        }
      ]
    },
    {
      "id": "spirits",
      "lens_label": null,
      "name": "Spirits, 80 proof (gin, rum, vodka, whiskey)",
      "serving": "1 shot (1.5 fl oz, 42 g)",
      "serving_g": 42,
      "caffeine_mg": 0,
      "alcohol_g": 14,
      "fdc": {
        "id": 174815,
        "dataset": "SR Legacy",
        "description": "Alcoholic beverage, distilled, all (gin, rum, vodka, whiskey) 80 proof",
        "per100g": {
          "caffeine_mg": 0,
          "alcohol_g": 33.4
        }
      },
      "sources": [
        {
          "url": "https://fdc.nal.usda.gov/food-details/174815/nutrients",
          "name": "USDA FoodData Central, SR Legacy 174815: Alcoholic beverage, distilled, all (gin, rum, vodka, whiskey) 80 proof",
          "accessed": "2026-10-09"
        }
      ]
    }
  ],
  "fdc_licence": {
    "quote": "USDA FoodData Central data are in the public domain and they are not copyrighted. They are published under CC0 1.0 Universal",
    "url": "https://fdc.nal.usda.gov/api-guide",
    "accessed": "2026-10-09"
  }
}