Weight Analysis

Key Methods:

• Study completed using data between April 2021 & April 2023
• Participants in the study are those who automatically logged their weight through third-party weight tracking devices & shared these data with Nutrisense. Only those who recorded at least 4 weight measurements that spanned at least one week were included in the study.
• Data were cleaned to exclude outlier weight measurements.
• In total, that was 7356 members. Of those, 5062 recorded weight across at least one month, 3386 across at least two months, and 2361 across at least three months.
• These time periods are based on the first time a member started recording weight data and not since they started at NS. For example, if someone started recording their weight after one month, then they would only be at month 2 of weight data when they were at month 3 of Nutrisense.
• Median starting weight was 185 lbs

Visualize initial weight:

Visualize the weight change by month:

Summary table with numbers:

How to use the columns:

• time_periods = the length of time since a member first started recording weight data (not since they started NS)
• mean_weight_change = the percentage by which the average member changed their weight
• number_of_members = total sample of members in each month grouping
• perc_of_members_lost_weight = the percentage of members that lost any weight at all. If you look at the highest value of lbs list in the ‘weight_lbs_in_best_##perc’ columns, you could combine the two to say (for example, based on three month): “64% of members lost up to 24 lbs after three months.”
• weight_change_in_best_25perc = the range in weight change percent of the best 25% of all members. Here you could say (for month 3): “25% of members lost between 3.9 and 13.2% of their weight by the end of the third month”. This and all following ranges exclude the top 1% for a more conservative estimate that excludes exceptional members. For example, if you look at the boxplot for month one, you can see a point that goes down as far as ~27% weight loss. By excluding the top 1%, we can remove those anomalies and the greatest weight lost seen after the first month is only 6.6%.
• weight_change_in_best_50perc = the range in weight change percent of the best 50% of all members.
• weight_change_in_best_65perc = the range in weight change percent of the top 65% of all members. Used 65%, because if I used 75, it would include members that also gained weight. If I used 70, it includes many members that didn’t gain or lose weight.
• weight_lbs_in_best_##perc = same as the metrics above, but multiplied by the median weight of 185 lbs to show the actual loss in lbs. Here you could say (for 25% month 3): “25% of members lost between 7 and 24 lbs by the end of the third month”