$30 off During Our Annual Pro Sale. View Details »

Nine months of food

Lars Yencken
October 17, 2013
180

Nine months of food

A talk I gave on food tracking to the Melbourne Quantified Self Meetup.

Lars Yencken

October 17, 2013
Tweet

Transcript

  1. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Nine months of food
    Lars Yencken
    Melbourne Quantified Self Meetup
    17th October 2013

    View Slide

  2. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Attempts at measurement
    ▶ Location: GPS tracking over time
    ▶ Habits: daily habits like meditation
    ▶ Writing: patterns and themes in my writing
    ▶ Coding: how long I spend editing what
    ▶ Food: what I eat when

    View Slide

  3. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Earlier this year...
    ▶ Overweight at 94 kg
    ▶ In at-risk category for diabetes
    ▶ Active-ish, but not fit
    ▶ Long hours of computer work

    View Slide

  4. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    More generally
    ▶ Modern food
    ▶ Quantity: our bodies mislead us, food is abundant*
    ▶ Quality: food is optimised for taste, not health
    ▶ Intolerance: our diet contains vast numbers of ingredients
    ▶ Modern living
    ▶ Sedentary workplaces: we sit, all day

    View Slide

  5. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    My weight
    Historic range 87-105 kg
    Jan 2013 94 kg

    View Slide

  6. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    My weight
    Historic range 87-105 kg
    Jan 2013 94 kg
    Target (bet) 85 kg

    View Slide

  7. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Tools
    Easy Diet Diary Bathroom scales

    View Slide

  8. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Binges?

    View Slide

  9. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    How it unfolded...
    1. I became hungry, very hungry, and tired
    2. To eat more, I drifted to a healthier range of foods
    3. To eat more, I increased my exercise
    4. I lost about 12 kg
    5. My energy largely returned, and I found myself “fit”

    View Slide

  10. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    2012 2013
    80 85 90 95
    Weight over time
    Date
    Weight (kg)

    View Slide

  11. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Dataset

    View Slide

  12. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    ▶ Food
    ▶ 185 days of meals
    ▶ 11.5 items/day on average
    ▶ 550 distinct food items (manually relabelled)
    ▶ Weight and macronutrients per item
    ▶ Weight
    ▶ 223 days of body mass and body fat percentage
    ▶ Exercise
    ▶ 185 days, still locked in software

    View Slide

  13. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    What did I eat?

    View Slide

  14. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Most common foods
    Food Count
    bread 88
    protein 85
    alcohol-beer 84
    crispbread 82
    coffee 73
    milk-cow 70
    vegies-tomato 67
    vegies-cucumber 62
    fruit-banana 61
    salad 53

    View Slide

  15. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    How much do I eat?

    View Slide

  16. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    0 5000 10000 15000 20000 25000
    0e+00 2e−05 4e−05 6e−05 8e−05 1e−04
    Daily energy consumption (gross)
    Energy (KJ)
    Frequency

    View Slide

  17. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    How much can I eat?

    View Slide

  18. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Tomorrow’s weight change based on how much I eat today
    (wt+1 − wt
    ) = α(et
    − ebase
    ) + noise

    View Slide

  19. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    > summary(lm(w$weightdiff ~ w$energy))
    ...
    Coefficients:
    Estimate Std. Error t value Pr(>|t|)
    (Intercept) -4.545e-01 1.505e-01 -3.020 0.00310 **
    w.e$energy 4.071e-05 1.458e-05 2.791 0.00613 **
    ---
    Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
    Residual standard error: 0.6491 on 118 degrees of freedom
    (53 observations deleted due to missingness)
    Multiple R-squared: 0.06194, Adjusted R-squared: 0.05399
    F-statistic: 7.791 on 1 and 118 DF, p-value: 0.006125

    View Slide

  20. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    ebase
    11.2 MJ
    α 40.7 g per MJ
    (24.6 MJ per kg)
    fat 37 MJ per kg

    View Slide

  21. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    ebase
    11.2 MJ
    α 40.7 g per MJ
    (24.6 MJ per kg)
    fat 37 MJ per kg
    but... missing exercise data

    View Slide

  22. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Do large breakfasts help?

    View Slide

  23. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    0 2000 4000 6000 8000
    0 5000 10000 15000 20000
    Breakfast vs rest of day
    Breakfast (kJ)
    Rest of day (kJ)

    View Slide

  24. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    How much meat do I eat?

    View Slide

  25. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    ▶ Manually tagged foods containing meat
    ▶ Results
    ▶ 20% of days meat free
    ▶ 63% of meals meat free

    View Slide

  26. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Breakfast Lunch Snacks Dinner
    Vegetarian 141 (78%) 80 (47%) 145 (91%) 57 (35%)
    With meat 39 (22%) 89 (53%) 14 (9%) 105 (65%)
    Total 180 169 159 162

    View Slide

  27. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    What foods do I eat together?

    View Slide

  28. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Itemsets
    Support Food
    46 vegies-cucumber + vegies-tomato
    37 crispbread + vegies-tomato
    37 crispbread + vegies-cucumber
    34 crispbread + vegies-cucumber + vegies-tomato
    32 fruit-banana + protein
    32 bread + vegies-tomato
    30 alcohol-beer + vegies-tomato
    30 alcohol-beer + vegies-cucumber
    29 coffee + protein
    29 bread + vegies-cucumber

    View Slide

  29. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .

    View Slide

  30. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    How much caffeine do I consume?

    View Slide

  31. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Jan 05
    2013
    Feb 08
    2013
    May 01
    2013
    Jun 03
    2013
    Jul 22
    2013
    Sep 01
    2013
    Oct 01
    2013
    0 20 40 60 80 100
    Caffeine consumption per day (rolling mean)
    Caffeine (mg)

    View Slide

  32. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Data wierdness
    ▶ Varying granularity of meals
    ▶ Low-density foods sometimes left out
    ▶ Not enough detail for intolerances

    View Slide

  33. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    In retrospect
    ▶ Great benefits
    ▶ Measurement has helped me become healthy
    ▶ Much unresolved
    ▶ What foods make me most alert?
    ▶ Am I intolerant to foods I eat?
    ▶ Need matching datasets to answer more questions

    View Slide

  34. .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    .
    .
    ..
    .
    Thanks!

    View Slide