I have been using my calorie counter I made for a couple months now and I was curious to see how well the number of non-zero calorie items I entered each day correlated with my total calories for the day.

If I aggregate the daily data I get an r-squared of only 0.2 but if I aggregate it by week I get an r-squared of 0.7

I am not very good at statistics but does this suggest that tracking the number of items I eat in a week might be a fairly good predictor of how many calories I ate that week? If so then maybe just counting the number of items I eat per week might be a good enough metric to limit calories. I would assume the monthly item aggregate would be even more accurate estimate/correlate.

I don’t understand if anyone has ever bothered to have patients just count their items instead of calories? This would be way faster and easier and perhaps still pretty effective, especially for people who get discouraged pretty easily at doing a lot of data entry.