Preconception Lifestyle Interventions to Improve Future Metabolic Health (Before the Beginning)

Inclusion Criteria: * contemplating pregnancy within the next six months * At least one of the following criteria: BMI ≥ 25 \< 40 kg/m2, gestational diabetes in a previous pregnancy, previous infant \> 4.5 kg, fasting plasma glucose \> 5.3 mmol/L, or Non-European ethnicity Exclusion Criteria: * On-going pregnancy * Trying to conceive ≥ 6 cycles at study entry * Known diabetes (type 1 or 2) * Shift work that includes night shifts \> 2 days per week * Previous hyperemesis * Known cardiovascular diseases * High intensity exercise ≥ 2 hours/week the last 3 months * Habitual eating window ≤ 12 hours