Pregnancy nutrition has genuinely strong evidence in places. Other areas — menopause in particular — are far more mixed than the market suggests.
Menstrual, pregnancy-related, menopausal and female-specific outcomes.
20 foods, grouped by the strongest rating any of its claims in this area reaches. Ratings describe the research, not the food. How ratings are decided.
Consistent findings across multiple good-quality human studies.
Several human studies point the same way, with real caveats.
Gallus gallus domesticus
A small, soft organ meat with a milder flavour and finer texture than beef liver, which is why it dominates pâtés and parfaits.…
Iron status: Has been studied for improving iron status. Chicken liver supplies heme iron at a high concentration, and interventions using liver-based foods report improved iron markers in iron-deficient groups.
Bos taurus
Beef trimmings ground to a uniform texture and sold by lean-to-fat ratio, most commonly between 70% and 95% lean. The ratio is…
Iron status: Has been studied for its effect on iron status. Beef supplies heme iron, which is absorbed more efficiently and is less affected by dietary inhibitors than the non-heme iron in plant foods; trials in iron-depleted groups report improvements in iron markers.
Glycine max
The legume behind tofu, soy milk, tempeh and miso, eaten either as mature dry beans or as edamame, the immature green pod…
Menopausal symptoms: Some trials report reduced hot flush frequency with soy isoflavones, with the effect concentrated in people whose gut bacteria produce equol, and with large placebo responses complicating interpretation.
Early human work, or mostly lab and animal research.
Bos taurus
The metabolic and storage organ of cattle, and consequently one of the most nutrient-concentrated foods in the human diet by a…
Pregnancy nutrition: Has been studied as a source of choline, folate, iron and vitamin B12, all of established importance in pregnancy. This has to be read alongside the strong advice against liver in pregnancy because of its preformed vitamin A content.
Capsicum annuum
Non-pungent cultivars of Capsicum annuum, harvested green or left to ripen to red, yellow or orange. Ripening changes their…
Iron status: Research suggests that a vitamin C source eaten with a plant-based meal increases absorption of the iron in that meal, and red peppers are a concentrated source. Studies using peppers specifically, or measuring iron status over months, are lacking.
Phoenix dactylifera
The dried fruit of the date palm, around two-thirds to three-quarters sugar by weight, and used both as a fruit and as a…
Pregnancy nutrition: Several small trials report that eating dates in the last weeks of pregnancy is associated with more favourable cervical status at admission and less use of induction agents. The trials are small, concentrated in a few centres, at meaningful risk of bias, and reviews describe the finding as promising rather than settled.
Gallus gallus domesticus
The fat-soluble half of the egg, carrying essentially all of its fat, cholesterol, fat-soluble vitamins, choline and carotenoid…
Pregnancy nutrition: Has been studied as a dietary source of choline, a nutrient with established requirements that rise in pregnancy and lactation and that most pregnant people fall short of. Trials of choline supplementation and infant outcomes are small and mixed.
Ovis aries
Meat from sheep slaughtered under about a year old, with a distinctive flavour that comes largely from branched-chain fatty acids…
Iron status: Has been studied as a heme iron source. Lamb sits alongside beef among the denser dietary sources of well-absorbed iron, but trials testing lamb specifically for iron markers are few.
Citrus limon
A highly acidic citrus fruit used mainly for its juice and zest rather than eaten whole. Citric acid makes up a large share of…
Iron status: Research suggests that adding a vitamin C source such as lemon juice to a plant-based meal increases iron absorption from that meal. Studies using lemon specifically, and studies measuring iron status over time, are sparse.
Lens culinaris
Flat pulses sold whole or split, and the only common legume that cooks from dry without soaking. The USDA reference entry is for…
Iron status: Evidence is limited. Lentils carry appreciable non-heme iron, but absorption is constrained by phytate, and trials showing improved iron status from lentil intake alone are scarce.
Panicum miliaceum
A group of small-seeded, drought-tolerant cereals staple across the Sahel and South Asia, sold hulled and cooked like rice or…
Iron status: Has been studied in iron-deficient populations, where iron-biofortified pearl millet has improved iron status in trials. This applies to biofortified varieties in deficient populations rather than to millet generally.
Mytilus edulis
Rope- or bottom-grown bivalves that need no feed input, making them one of the lowest-impact animal foods produced. They open…
Iron status: Has been studied as a source of well-absorbed iron and vitamin B12. Mussels are unusually iron-dense for seafood, but direct trials on iron status are few.
Salvia officinalis
The grey-green leaf of Salvia officinalis, used fresh or dried and traditionally paired with fatty meats. The USDA entry is per…
Menopausal symptoms: Small trials of sage preparations report reductions in hot flush frequency and intensity. They are few, several are open-label or manufacturer-run, they are short, and hot flush reporting responds strongly to placebo.
Whole cooked soybeans bound into a firm cake by Rhizopus mould, an Indonesian ferment that keeps the beans intact rather than…
Menopausal symptoms: Some trials report reductions in hot flush frequency with soy isoflavone intake, but results vary widely, partly because only some people carry the gut bacteria that convert daidzein to equol. Tempeh specifically has rarely been the tested food.
Not enough human research to say anything useful yet.
Gallus gallus domesticus
Dark leg meat, richer in myoglobin, fat and connective tissue than breast because these are the muscles the bird actually uses.…
Iron status: Has been studied as a source of heme iron. Dark poultry meat carries more iron than breast, though considerably less than red meat or organ meat, and food-specific trials in poultry are few.
Salmo salar
The great majority of salmon sold worldwide, raised in sea pens on formulated feed. It is consistently fattier than wild salmon,…
Pregnancy nutrition: Has been studied as a low-mercury source of DHA during pregnancy, which national advisories recommend two to three portions of per week. Trials of maternal DHA and child outcomes have produced mixed results.
Linum usitatissimum
The seed of the flax plant, sold whole, ground or pressed for oil, and the densest common dietary source of plant lignans. The…
Menopausal symptoms: Flaxseed lignans are widely promoted for hot flushes, and the randomised trials do not support it. Where placebo-controlled trials exist, flaxseed has generally performed no better than placebo, despite large improvements in both arms.
Citrus x sinensis
The sweet orange, a hybrid citrus grown commercially on every inhabited continent. Most of the world crop is pressed for juice…
Iron status: Research suggests vitamin C eaten in the same meal as plant sources of iron substantially increases how much of that iron is absorbed. Whether this translates into better iron status over months is less consistently demonstrated than the single-meal effect.
Crassostrea virginica
Filter-feeding bivalve molluscs, farmed and wild-harvested, whose flavour tracks the water they grew in closely enough that…
Iron status: Has been studied as a source of well-absorbed iron. Oysters carry more iron than most seafood, but trials measuring iron status after eating them are scarce.