Occurrence of DDT in Human Fat and Milk
Laug, Kunze and Prickett's 1951 study measured DDT in 75 human fat samples and breast milk from 32 women, providing an early picture of population exposure and tissue storage before the health significance of those concentrations was clear.
What the study did and found
E. P. Laug, Frieda M. Kunze and C. S. Prickett's 1951 article “Occurrence of DDT in Human Fat and Milk.” examined 75 samples of human fat obtained at autopsy, biopsy or abdominal surgery and breast milk from 32 women. The work was planned as a preliminary investigation of DDT absorption from food in the general population. The analytical method could detect 1 microgram of DDT per gram of fat and 5 micrograms per 100 ml of milk. About one-quarter of the fat samples contained no detectable DDT, while the average concentration among all samples was 5.3 parts per million and two samples exceeded 20 parts per million. DDT was detected in all but three milk samples, with an average concentration of 0.13 parts per million. The authors stated that the health significance of these findings could not then be determined.
Why it is cited
The paper is cited as an early human biomonitoring report from the period when widespread DDT use was still relatively new. Later reviews of DDT in human milk have used 1951 measurements as part of long-term datasets showing how exposure changed after restrictions on DDT use. Its value is therefore historical as well as toxicological: it documented that DDT could be detected in human adipose tissue and milk before the persistence and population-scale behaviour of organochlorine pesticides were fully understood.
Later research confirmed the central observation that DDT and its metabolites are persistent, lipophilic chemicals that can accumulate in human adipose tissue and be measured in breast milk. Human retention is long, and DDE can persist for many years. At the same time, later risk assessment moved well beyond the 1951 paper's unresolved question of hazard by evaluating chronic exposure, reproductive and developmental effects, carcinogenicity and other outcomes. Concentrations in human milk have declined substantially in many regions following restrictions on DDT use, although exposure remains relevant in places where DDT is still used for disease-vector control.
The topic today
DDT is now considered within the broader group of persistent organic pollutants, and human milk remains an important matrix for population biomonitoring. Modern programmes use breast milk, blood and adipose tissue to track body burdens and evaluate changes over time. International controls under the Stockholm Convention have reduced many uses of DDT, while allowing restricted public-health use for vector control under specified conditions. The 1951 study is therefore best read as an early exposure record that preceded today's analytical methods, regulatory frameworks and formal human-health risk assessments.