By the peer-reviewed record, the women who pick Assam's tea carry anemia at a rate India would call a public health emergency anywhere else in the state. A 2025 review of the estate literature puts prevalence in surveyed tea gardens at 88 to 100 percent, depending on the garden. The story is not that tea causes it. It is not that simple, and this office will not pretend otherwise. The diet on a tea garden is too thin in iron to begin with, and the cup brewed from that same garden's leaf, strong, the way this office has certified it since 1839, measurably works against what little iron the diet does carry.

The number, checked against two studies

A 2012 survey of 244 female workers on an upper Assam plantation found 182 of them anemic, 74.6 percent. Of those cases, 150 were nutritional and 32 were hereditary blood disorders, a five to one split that matters: nutritional anemia is fixable, and the same study proved it by giving iron, vitamin B12, and folic acid supplements to the affected women and recording real gains in three months.

That is one garden, one year. The 2025 Frontiers in Nutrition review widens the lens, citing multiple community-based studies across Assam's tea estates that found anemia in 88 to 100 percent of the women surveyed, a range so high it reads as a typo until you check the source twice, which this office did. Assam's own tea garden hospitals, required by law since 1956 and already certified on this site, exist in part to screen for exactly this. Screening and curing are not the same act, and the second one keeps losing.

What is actually on the plate

The gap starts before anyone pours a cup. A 2020 study of 134 women across three Jorhat district plantations recorded one worker's own words plainly: "we cannot eat on time. With this wage, can we eat good food by keeping our children hungry?" Most reported eating rice, potatoes, and whatever vegetables were locally in season, on repeat, and skipping meals outright to keep pace with the day's picking quota.

Wages set the ceiling on that plate. The same study found private-estate workers earning around 126 rupees a day (about US$1.70 at the time), government-estate workers around 115, both below what a household needs to buy a genuinely varied diet. Oxfam's 2019 field research found half the households it visited held a below-poverty-line ration card, entitling a family to five kilograms of rice per person a month and nothing else guaranteed. A 2022 nutrition program working across Assam's own estates measured the ceiling in numbers: at baseline, only 16 percent of workers in the intervention group and 8 percent in the comparison group met the minimum standard for dietary diversity, and the program's own authors noted plainly that meeting the minimum outright would have cost more than a worker's weekly wage.

Rice and potato is a carbohydrate-heavy, iron-poor diet by design of poverty, not by choice. That was true before this office ever gets to what a strong cup does on top of it.

The cup does not help

Tea's tannins bind non-heme iron, the plant-derived kind that makes up most of the iron in a rice-and-vegetable diet, into an insoluble compound the gut cannot absorb. South African researchers first demonstrated the mechanism directly in human volunteers in 1975, tracing the effect to iron-tannate complexes forming in the gut before the mineral ever reaches the bloodstream. A 2022 review in the journal ACS Omega puts a number on it: tea cut iron absorption from fortified bread by 56 to 72 percent in one controlled study, and by more than 85 percent against a fortified salt in another. Heme iron, the kind in meat, is often assumed to be immune. The same review found polyphenols can suppress it too, at a high enough dose, just less severely than they suppress the non-heme kind a mostly vegetarian, poverty-level diet depends on.

One review of the coffee-and-tea literature, reported by the health outlet Healthline, found black tea specifically, not green, carried a real, measurable association with higher anemia risk. Assam is black tea, brewed strong, exactly the profile the finding points at. None of this makes tea the cause. It makes tea a second, avoidable weight on a scale already tipped by what is and is not on the plate.

The one variable actually within reach

A worker's wage is not this office's to certify. A gap between the cup and the meal is. Clinical guidance on iron-deficiency anemia commonly recommends spacing tea at least an hour from a meal or an iron tablet, since tea taken between meals rather than with them measurably softens the inhibitory effect. Vitamin C works the other side of the same problem: added at the meal itself, it can counteract tannin's grip on iron at low to moderate tannin doses, though the ACS Omega review found it stops helping once the tannin dose climbs high enough, which a very strong cup taken alongside food will do.

Neither fix touches the wage, the ration card, or the plate a family can actually afford, and this office will not certify a cup of tea as a substitute for either. What it will certify is the plain arithmetic: a workforce already short on iron, drinking the strongest tea on earth with its meals rather than around them, is paying a second, needless cost on top of the first. Move the cup an hour either way, and at least one part of that arithmetic gets easier.