For how we live.
A meta-analysis of 10 randomised trials found ultra-processed diets raised weight and eating rate, yet the effect on how much people ate mostly disappeared when diets were not more energy-dense.
Guidelines set weight-gain ranges by starting BMI, not a doubled appetite. A large meta-analysis links gaining outside those ranges to worse outcomes at both ends — smaller and larger babies alike.
Probably not ideal. Even moderate light during sleep measurably raises night-time heart rate and next-morning insulin resistance, and in one large study women who slept with a light or TV on gained more weight.
A retrospective analysis of 54,114 women on a digital weight-loss service found those with PCOS lost as much as those without. But only 40 PCOS users reached the 10-month mark, and the data are observational.
In 38,283 nurses tracked through the transition, low-insulinemic and planetary-health eating patterns had the strongest associations with less weight gain. The average woman still gained 0.8 kg a year.