Plans tied to a moment
Across 94 tests, "if it's this time, I'll do that" plans had a medium-to-large effect on reaching goals, helping most with getting started. Gollwitzer & Sheeran 2006.
Logging is the habit
In a review of 22 studies, keeping track of what you eat was consistently linked with weight loss, though the studies had real limits. Burke 2011.
Prompts can help
Of 19 studies of regular prompts for diet, activity or weight, 11 found they helped, more so when frequent. Long-term effects weren't studied. Fry & Neff 2009.
Regular sleep times
In 60,977 adults wearing a wrist sensor, more regular sleep was linked with a 20–48% lower risk of death than the least regular, and predicted it better than sleep length. Windred 2024.
These are links and averages, not promises. Fullday is for general wellness, not a medical device.