Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Lifestyle and preconception optimisation
Obstetrics and gynaecology · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Protect health without delaying time-critical care
Preconception optimisation is usually planned, but medical instability from an eating disorder, acute substance withdrawal, severe uncontrolled chronic disease or imminent gonadotoxic treatment needs urgent coordinated care.
Action: Stabilise acute illness, use specialist support for dependence or severe nutritional compromise, and make fertility-preservation referral promptly before gonadotoxic treatment rather than making lifestyle change a prerequisite.
Role and principles
Improve preconception health and modifiable fertility factors with specific, non-judgemental interventions while avoiding unsupported restrictions, supplement claims and treatment delay.
Preconception optimisation improves the health context in which pregnancy begins and can modify some causes of delayed conception. It is not a moral test or a promise of pregnancy. Frame recommendations as practical risk reduction, ask what is feasible and avoid withholding investigation solely because weight, smoking or another behaviour has not yet changed. Age, known disease and planned gonadotoxic treatment may make simultaneous referral more important than a prolonged optimisation period.
For people attempting conception through vaginal intercourse, every 2 to 3 days across the cycle optimises pregnancy probability. This approach covers the fertile window despite cycle variation and may be less burdensome than daily temperature charts or repeated predictor tests. When artificial insemination is the route, timing around ovulation matters. Ask about pain, vaginismus, erectile or ejaculatory difficulty rather than assuming low frequency reflects poor adherence.
Alcohol advice distinguishes fetal safety from semen effects. The UK Chief Medical Officers identify avoiding alcohol as the safest approach when pregnant or planning pregnancy. NICE notes that no more than 1 or 2 units once or twice weekly with no intoxication reduces fetal risk, but still advises that complete avoidance is safest. Excessive intake can impair semen quality; intake within 14 units per week spread across several days is unlikely to affect it. Offer dependency support when indicated.
Assessment and patient selection
Anovulation with higher weight
BMI at least 30 with irregular cycles may improve with a supported nutrition and activity programme, while assessment for PCOS and other causes proceeds.
Low energy availability
Weight loss, restricted intake, high exercise and absent or irregular periods indicate hypothalamic suppression even when BMI is not dramatically low.
Androgen-associated suppression
Testosterone replacement or anabolic steroid use can markedly suppress LH, FSH and sperm production and requires specialist fertility planning.
Higher-dose folate indication
A previous neural-tube-defect pregnancy, relevant personal or family congenital-malformation history, diabetes, certain haematological conditions or folate-antagonist medicines supports 5 mg folic acid.
Occupational exposure
Solvents, pesticides, ionising radiation, lead or heat exposure should prompt a specific risk assessment through occupational health rather than generic advice.
Red flags requiring action
Bradycardia, hypotension, syncope, electrolyte disturbance, very low intake or rapid weight loss requires urgent medical and eating-disorder assessment.
Severe hypertension, decompensated cardiac disease, uncontrolled diabetes or another major condition may make pregnancy immediately unsafe and needs specialist pre-pregnancy review.
Baseline assessment
01Medication and substance reconciliationFirst step
Why
Identify prescribed, over-the-counter, complementary, recreational and performance-enhancing exposures affecting fertility or pregnancy.
Interpretation and limitations
Each exposure needs a product- and condition-specific plan; necessary medicines should not be stopped abruptly, and exogenous androgens are a major reversible male-factor cause.
02Weight, BMI and trajectory
Why
Recognise higher-weight risk, weight loss, energy deficit and change over time.
Interpretation and limitations
BMI supports but does not replace nutritional assessment; hypothalamic suppression can occur at a normal BMI and BMI alone does not determine folic-acid dose.
03Rubella immunity when vaccination is uncertain
Why
Identify susceptibility before pregnancy so live vaccination can be given safely.
Interpretation and limitations
Vaccinate susceptible people and advise avoiding pregnancy for at least 1 month; document the plan to prevent duplicate delay.
04Condition-specific preconception review
Why
Assess control and treatment safety for diabetes, epilepsy, hypertension and other chronic disease.
Interpretation and limitations
Use relevant measures such as HbA1c, blood pressure, renal function or drug levels only according to the condition and guideline, then coordinate specialist optimisation.
Interventions
01Shared reviewIdentify changes that matterFirst stepA person or couple is planning pregnancy or starting fertility assessment.+
1Ask about conception route and frequency, smoking, alcohol, weight trajectory, nutrition, exercise, medicines, substances, chronic disease, vaccination and occupational hazards.
2Prioritise high-impact and time-sensitive issues with the person, explicitly separating pregnancy safety, general health and evidence for fertility.
3Begin appropriate fertility investigation or referral in parallel when age or a known cause makes delay harmful.
02Medication planOptimise without destabilising diseaseA prescribed, over-the-counter or recreational exposure may affect gametes or pregnancy.+
1Confirm indication, dose, prescriber and timing, including testosterone, anabolic steroids, GLP-1 agonists, finasteride, NSAIDs and complementary products.
Medicines and treatment safety
Prevents fetal neural-tube defects when taken before conception and during early pregnancy; it is not a fertility treatment.
Folic acid
Take 400 micrograms orally once daily, ideally for about 3 months before conception and through the first 12 weeks; use 5 mg once daily for the defined higher-risk groups in NICE NG247.
BMI 25 kg/m² or above alone is not an indication for 5 mg under current NICE guidance. Confirm higher-dose need from history, diabetes, haematological condition or folate-interfering medicines.
Targets, monitoring and follow-up
Review smoking-cessation progress and passive exposure using supportive follow-up rather than making access to assessment conditional on abstinence.
Track weight trajectory, cycle pattern, nutritional adequacy and medical observations when anovulation or low energy availability is present.
Confirm chronic-disease control and completion of any medicine switch or washout before pregnancy attempts resume where clinically required.
Document folic-acid dose, rubella immunity or vaccination date and the one-month post-vaccine interval.
Reassess priorities and referral urgency as time passes; optimisation should not become an open-ended barrier to evidence-based fertility care.
Special situations
Regular exposure beats perfect timing
Intercourse every 2 to 3 days generally covers the fertile window and may reduce the burden created by exact ovulation prediction.
Folate dose changed in emphasis
Current NICE guidance says BMI 25 or above alone does not require high-dose folic acid; use 400 micrograms unless another defined 5 mg indication exists.
Testosterone is a fertility exposure
Always ask directly because prescribed replacement and non-prescribed anabolic steroids can suppress sperm production profoundly.
Caffeine is not a scapegoat
NICE finds no consistent link between caffeinated beverages and fertility problems, although pregnancy intake advice applies after conception.
Optimise in parallel
Supported health change and fertility investigation can proceed together, particularly when age, ovarian reserve or a known cause makes time important.
Common pitfalls
01
Treating lifestyle as blame or requiring an ideal BMI before even investigating a person with age-related or known fertility risk.
02
Advising abrupt cessation of essential medicines without the prescriber or specialist and without accounting for relapse risk.
03
Missing testosterone, anabolic steroids, GLP-1 agonists, over-the-counter NSAIDs or complementary products during medication reconciliation.
04
Prescribing 5 mg folic acid solely because BMI is 25 or above despite the current NG247 recommendation.
05
Promising complementary therapies, antioxidants, loose underwear or strict caffeine avoidance will restore fertility.
06
Giving live rubella vaccine without explaining that pregnancy should be avoided for at least one month afterwards.
Practice
Two practice questions
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Question 1 of 2
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Obstetrics and gynaecologyOriginal SBA
Current folic-acid advice for BMI alone
A person with BMI 31 kg/m² is planning pregnancy. There is no diabetes, previous affected pregnancy, relevant family history, haematological condition or folate-interfering medicine. Which folic-acid regimen does current NICE guidance recommend?
Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources
Sources and review status
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.
Smoking is likely to reduce fertility in the person trying to become pregnant, passive exposure also matters, and smoking is associated with poorer semen quality. Offer behavioural and pharmacological cessation support through current NHS pathways rather than only telling someone to stop. Include vaping and nicotine use in the history while being clear where fertility evidence is less mature. The objective is durable cessation and reduced exposure, not stigma.
Discuss weight through health, ovulation and treatment safety. With BMI at least 30, conception may take longer; weight reduction can restore ovulation in some anovulatory people, and combined group exercise and dietary programmes outperform advice alone. Male BMI at least 30 is associated with reduced fertility. At the other extreme, BMI below 18.5 with irregular or absent periods suggests energy insufficiency; increasing intake, moderating excessive exercise and treating disordered eating can restore reproductive-axis function.
Review every medicine and substance before conception without stopping necessary treatment abruptly. Exogenous testosterone and anabolic steroids suppress spermatogenesis. GLP-1 receptor agonists require product-specific pregnancy planning; finasteride, NSAIDs, some lubricants and recreational drugs warrant individual advice. Optimise epilepsy, diabetes, hypertension, mental-health, autoimmune and other chronic-condition medicines with the relevant specialist, balancing relapse risk against pregnancy safety.
Folic acid prevents neural-tube defects but is not a fertility treatment. NICE NG247 recommends 400 micrograms daily, ideally for about 3 months before conception and through 12 weeks of pregnancy. Use 5 mg daily for defined risks: either genetic parent or family history of neural-tube defect or other congenital malformation, a previous affected pregnancy, type 1 or type 2 diabetes, relevant haematological conditions or medicines that interfere with folate. BMI 25 or above alone does not require more than 400 micrograms under current guidance.
Complete relevant preventive care without creating unnecessary delay. When rubella vaccination is uncertain or absent, test susceptibility, offer vaccination if needed and avoid pregnancy for at least a month. Review cervical screening timing, dental health, infection risks and occupational exposures. Provide vaccine and travel advice according to destination and clinical risk. Complementary fertility therapies have not been adequately evaluated, and high-dose supplements can cause harm or interact with medicines.
Caffeine deserves proportionate counselling: NICE finds no consistent association between caffeinated beverages and fertility problems, so it should not be blamed for delayed conception. Once pregnant, follow current pregnancy caffeine advice. Likewise, loose underwear cannot be promised to improve fertility even though elevated scrotal temperature is associated with poorer semen quality. Direct occupational exposure concerns to workplace occupational health rather than suggesting resignation without assessment.
Key points
Offer vaginal intercourse every 2 to 3 days when this is the chosen route; timing every attempt to an ovulation app can add pressure without improving on regular exposure.
Advise the person who may become pregnant that avoiding alcohol is the safest approach; excessive alcohol also harms semen quality.
Smoking reduces female fertility and is associated with poorer semen quality; offer evidence-based cessation support and address passive smoke exposure.
BMI of 30 kg/m² or above is associated with longer time to conception and reduced male fertility; in anovulatory people, supported weight reduction can improve ovulation.
BMI below 18.5 with irregular or absent menstruation warrants nutritional and exercise review because weight restoration can improve conception chance.
Ask specifically about prescription, over-the-counter and recreational exposures including GLP-1 agonists, testosterone, finasteride, NSAIDs, lubricants, anabolic steroids and cannabis.
Use folic acid 400 micrograms daily ideally for about 3 months before conception and through the first 12 weeks; use 5 mg daily only for defined higher-risk indications, not BMI 25 or above alone.
Check rubella status when vaccination is absent or uncertain, vaccinate susceptible people and advise avoiding pregnancy for at least 1 month afterwards.
Dependence with risk of alcohol, benzodiazepine or opioid withdrawal requires supervised clinical management rather than abrupt unsupported cessation.
Current interpersonal violence, reproductive coercion or sexual abuse requires private safeguarding assessment and person-led support.
Planned chemotherapy, pelvic radiotherapy or gonadal surgery needs expedited fertility-preservation discussion before treatment wherever possible.
05Cervical screening status
Why
Avoid preventable delay once fertility treatment starts and maintain national screening participation.
Interpretation and limitations
Offer screening only when due under the national programme; an out-of-date test is not a reason to perform non-programme screening.
06Occupational-health risk assessment
Why
Characterise dose, route, controls and alternatives for suspected reproductive hazards.
Interpretation and limitations
A named exposure and workplace assessment are more useful than attributing infertility to an occupation without evidence.
2
Use product-specific and condition-specific guidance with the relevant specialist; do not abruptly stop antiseizure, psychiatric, steroid or other essential treatment.
3Document the agreed stop, switch, washout or continuation plan and what contraception or monitoring is required until it is complete.
03Nutrition and folateSupport adequate energy and prevent neural-tube defectsPregnancy is being actively planned before conception occurs.+
1EscalationAssess dietary adequacy, food insecurity, weight change and excessive exercise, escalating medical instability or eating-disorder risk.
2Start folic acid 400 micrograms daily ideally 3 months before conception through 12 weeks, or 5 mg for a defined NG247 higher-risk indication.
3Offer structured weight-management support when wanted and appropriate, but avoid crash diets, unsupported supplements or arbitrary referral delays.
04Vaccination and preventionClose avoidable pre-pregnancy gapsVaccination, infection, screening or occupational history reveals an action.+
1Test rubella status when vaccination is absent or uncertain, vaccinate if susceptible and advise avoiding pregnancy for at least 1 month.
2Check cervical screening against programme dates and provide individual infection, travel, dental and occupational advice.
3Confirm completion and communicate it to the fertility team so preventive work does not become repeated or fragmented.