| "Aider les femmes à suivre leur ovulation plus intelligemment" | 
If you’ve started eating better, moving more, or generally cleaning up your habits before trying to conceive, a big new review has an honest answer about whether that effort pays off: it depends less on the advice itself and more on how it’s delivered.
Researchers pooled 24 randomized controlled trials (RCTs), studies that randomly assign participants to a program or a control group, covering 7,795 women planning a pregnancy. Overall, lifestyle programs didn’t clearly improve pregnancy or live birth rates. But specific programs, the more structured, hands-on ones, did noticeably better.
Short version: a generic « eat better, move more » pep talk isn’t what moved the needle. Consistency and structure were.
Key takeaways
- A 2025 review of 24 trials and 7,795 women found no clear overall difference in pregnancy or live birth rates from preconception lifestyle programs versus standard care.
- Programs delivered over 10 or more sessions had much better odds of clinical pregnancy than shorter ones (more than double the odds).
- Programs that gave people physical tools, like food or exercise equipment, rather than advice alone, also showed a much stronger effect.
- Lifestyle programs did reduce weight and fasting blood glucose overall, with the biggest weight loss in programs that specifically aimed for weight loss and met in person.
What the researchers looked at
Published in Human Reproduction Update (2025), the review searched for randomized controlled trials (RCTs) that compared a lifestyle intervention (diet, exercise, or both) against standard or minimal care in women planning a pregnancy. Most of the 24 included trials were done in high-income countries (79%), and two-thirds of participants were women already dealing with infertility. Researchers then broke the interventions down using two standardized frameworks, one for intervention design and one for specific behaviour change techniques (BCTs), the individual strategies programs use to try to change habits, to see which pieces actually correlated with better outcomes.
Do preconception lifestyle programs improve your chances of getting pregnant?
Not as a blanket rule. Across all 24 trials, there was no statistically significant difference in clinical pregnancy (odds ratio 1.06) or live birth (odds ratio 1.17) between women in a lifestyle program and those in standard care.
But that overall number hides real variation. Programs delivered over 10 or more sessions had much better odds of clinical pregnancy than shorter ones (odds ratio 2.17 versus 0.88). And programs that used the behavior change technique of adding objects to the environment, meaning they gave participants things like meal kits or exercise equipment instead of just advice, showed an even bigger difference (odds ratio 3.51 versus 0.90).
What the research found, by the numbers
Here’s how specific program features compared, in the researchers’ own numbers:
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| Outcome | What the researchers found | Evidence quality |
|---|---|---|
| Overall pregnancy/live birth vs. standard care | No statistically significant difference: clinical pregnancy OR 1.06 (0.84-1.35); live birth OR 1.17 (0.82-1.67). | Moderate certainty (per the study). Note: these analyses covered 2,500 women (pregnancy) and 1,539 (live birth), not the full 7,795. |
| Programs with 10+ sessions vs. fewer | Clinical pregnancy odds more than doubled: OR 2.17 vs. 0.88 (p = 0.004 for the difference). | Exploratory/low certainty: subgroup analysis, few studies |
| Programs providing physical tools (food/equipment) vs. advice alone | Far higher clinical pregnancy odds in that subgroup: OR 3.51 vs. 0.90 (p < 0.001 for the difference). | Exploratory/low certainty: subgroup analysis, few studies |
The authors caution that the session-count and physical-tools findings come from exploratory subgroup analyses with a limited number of studies, so they should be read as a promising pattern, not a proven formula.
Why did some programs work better than others?
The pattern researchers found: structure and repetition mattered more than the content of the advice itself. More touchpoints (10-plus sessions) and removing friction (providing the actual food or equipment) both beat a single conversation or handout. That lines up with a broader idea in habit research: a daily check-in tends to stick better than a one-time recommendation, even though this particular study was testing diet and exercise programs, not tracking apps.
What this means for building your own preconception routine
If you’re getting ready to start trying, the takeaway isn’t « lifestyle changes don’t matter »; it’s that how you structure them does. Premom’s guide to preparing for a healthy pregnancy walks through concrete steps and is great for whatever your starting point looks like.
The study’s real lesson is about structure, not a number on the scale: build repetition and support into whatever you try. If a prenatal vitamin is part of your plan, choosing one with intention (rather than grabbing whatever’s on the shelf) fits that same idea.
What this study doesn’t tell us
This review looked at structured diet and exercise programs, not fertility tracking apps, so the parallel to daily cycle tracking is an analogy, not a tested finding. Two-thirds of participants already had diagnosed infertility, so results may look different for someone just starting to plan a pregnancy.
Your next step
Skip the vague « get healthier » goal. Pick one concrete habit, and build repetition into it. Tracking your cycle daily with Premom is exactly that kind of structured, repeatable habit, so you walk into trying to conceive already knowing your pattern instead of starting from zero.
Start tracking your cycle today.
