Turtle data
Women log food on 37% fewer Sundays than Mondays
Key findings
About 840 women using Turtle's food diary logged on 37% fewer Sundays than Mondays (January to September 2026). On the Saturdays they did log, they logged about 80 kcal more than their own Monday to Thursday average. Source: Turtle Method member data, turtlemethod.com/data/weekend-food-logging/.
fewer food-logging days on a Sunday than on a Monday
Women log their food on far fewer weekend days than weekdays. In Turtle's food diary, from January to September 2026, the typical woman logged on 37% fewer Sundays than Mondays. Monday and Tuesday were the most-logged days, each about 119% of an average day; Saturday and Sunday were the least, at 76% and 75%.
Logged days as a share of each woman's average day (100% = average), Jan to Sep 2026
Source: Turtle Method member food diary data · CC BY 4.0
And the weekend days that are logged run higher
On the Saturdays they did log, women logged about 80 kcal more than on their own Monday to Thursday average, with Sundays about 44 kcal more and Fridays about 32 kcal more. Comparing each woman with herself takes out differences between people. The extra is modest, and the days that go unlogged may well be bigger still, so the real weekend difference is probably larger than the diary shows.
| Day | Logging (100% = average day) | Kcal logged vs own Mon to Thu |
|---|---|---|
| Monday | 119% | -3 kcal |
| Tuesday | 119% | +7 kcal |
| Wednesday | 114% | +12 kcal |
| Thursday | 106% | -3 kcal |
| Friday | 91% | +32 kcal |
| Saturday | 76% | +80 kcal |
| Sunday | 75% | +44 kcal |
About 840 women, each with 20 or more logged days. Figures are what women logged in the diary, not a measure of what they actually ate.
What the research says
Across studies, keeping a regular food record was consistently linked with more weight loss.
Burke LE, Wang J, Sevick MA (2011). Self-monitoring in weight loss: a systematic review of the literature. Journal of the American Dietetic Association. doi.org/10.1016/j.jada.2010.10.008
Adults in a year-long study tended to eat more at weekends, and their weight loss came on weekdays rather than weekends.
Racette SB, Weiss EP, Schechtman KB, et al. (2008). Influence of weekend lifestyle patterns on body weight. Obesity. doi.org/10.1038/oby.2008.320
Questions people ask
Do people stop tracking food at the weekend?
Many do. In Turtle's food diary data, women logged on 37% fewer Sundays than Mondays.
Do women log more calories at the weekend?
A little: logged Saturdays ran about 80 kcal above a woman's own Monday to Thursday average, and Sundays about 44 kcal.
Method
Daily food diary totals, 5 January to 27 September 2026 (38 full weeks, so each weekday appears equally). A logged day is 500 to 5,000 kcal; women needed 20 or more logged days. Women only, staff accounts excluded; every group shown has 50 or more women and sizes are rounded. This shows a pattern, not a cause. Full methodology.
Cite this
Free to use with credit and a link to the source page. The figures and chart on this page are licensed under CC BY 4.0.
Journalists: for another cut of the data (aggregates only, same rules), contact scott@turtlemethod.com. More data on the Turtle data hub.
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