The objective of this study was to determine uranium (U) and other heavy metal (HM) concentrations (As, Cd, Pb, Mo, and Se) in tissue samples collected from sheep (Ovis aries), the primary meat staple on the Navajo reservation in northwestern New Mexico. The study setting was a prime target of U mining, where more than 1100 unreclaimed abandoned U mines and structures remain. The forage and water sources for the sheep in this study were located within 3.2 km of abandoned U mines and structures. Tissue samples from sheep (n = 3), their local forage grasses (n = 24), soil (n = 24), and drinking water (n = 14) sources were collected. The samples were analyzed using Inductively Coupled Plasma-Mass Spectrometry. Results: In general, HMs concentrated more in the roots of forage compared to the above ground parts. The sheep forage samples fell below the National Research Council maximum tolerable concentration (5 mg/kg). The bioaccumulation factor ratio was >1 in several forage samples, ranging from 1.12 to 16.86 for Mo, Cd, and Se. The study findings showed that the concentrations of HMs were greatest in the liver and kidneys. Of the calculated human intake, Se Reference Dietary Intake and Mo Recommended Dietary Allowance were exceeded, but the tolerable upper limits for both were not exceeded. Food intake recommendations informed by research are needed for individuals especially those that may be more sensitive to HMs. Further study with larger sample sizes is needed to explore other impacted communities across the reservation.

This study reports on the harvesting, ingestion, and contamination of American Indian tea Thelesperma megapotamicum grown on the Navajo Reservation in New Mexico. Uranium (U) and co-metal(loid)s (As, Cd, Cs, Mo, Pb, Se, Th, and V) have contaminated local soil and plants. Tea plants were gathered for analysis near U mining impacted areas. The study collected samples of wild tea plants (n = 14), roots (n = 14), and soil (n = 12) that were analyzed with inductively coupled plasma mass spectrometry. Tea harvesting activities, behavior, and ingestion information were collected via questionnaires. Harvesting took place in community fields and near roadways. Results indicate edible foliage concentration levels for Cd exceeded the World Health Organization (WHO) raw medicinal plant permissible level guidelines. Tea samples collected near high traffic areas had significantly greater Cd and Mo concentrations than those collected near low traffic areas (p < 0.001). Tea sample metal(loid) concentration levels ranged from 0.019–7.916 mg/kg. When compared to established food guidelines including the WHO provisional tolerable weekly intake (PTWI), reference dietary intake, recommended dietary allowance, and the tolerable upper limit (UL), Cd exceeded the WHO guidelines but none exceeded the PTWI nor the UL. These findings warrant improved standardization and establishment of universal guidelines for metal(loid) intake in food.

More than 500 unreclaimed mines and associated waste sites exist on the Navajo Nation reservation as a result of uranium (U) mining from the 1940s through the 1980s. For this study, the impact of U-mine waste on a common, locally grown crop food was examined. The goal of this site-specific study was to determine metal(loid) concentration levels of arsenic (As), cadmium (Cd), cesium (Cs), molybdenum (Mo), lead (Pb), thorium (Th), U, vanadium (V) and selenium (Se) in Cucurbita pepo Linnaeus (squash), irrigation water, and soil using inductively coupled plasma-mass spectrometry. The concentrations of metal(loid)s were greatest in roots > leaves > edible fruit (p < 0.05), respectively. There were significant differences between metal(loid)s in squash crop plot usage (<5 years versus >30 years) for V (p = 0.001), As (p < 0.001), U (p = 0.002), Cs (p = 0.012), Th (p = 0.040), Mo (p = 0.047), and Cd (p = 0.042). Lead and Cd crop irrigation water concentrations exceeded the United States Environmental Protection Agency (USEPA) Maximum Contaminant Levels for drinking water for those metals. Edible squash concentration levels were 0.116 mg/kg of As, 0.248 mg/kg of Pb, 0.020 mg/kg of Cd, and 0.006 mg/kg of U. Calculated human ingestion of edible squash did not exceed Provisional Tolerable Weekly Intake or Tolerable Upper Limit levels from intake based solely on squash consumption. There does not appear to be a food-ingestion risk from metal(loid)s solely from consumption of squash. Safer access and emphasis on consuming regulated water was highlighted. Food intake recommendations were provided. Continued monitoring, surveillance, and further research are recommended.

Pain is a common symptom among cancer survivors, yet is rarely talked about by American Indians. Understanding the reasons for reduced communication by American Indian cancer survivors is important for healthcare providers, family members, and others providing treatment and support for cancer symptoms. Thirteen focus groups with Southwest American Indian adult cancer survivors were audiotaped and transcribed as part of a randomized intervention to remove barriers to cancer symptom management. Constant comparative methods were employed in the data analysis, topic categories were grouped for comparison, and final assessment followed Grounded Theory methods. Findings were categorized into two major groupings: communication with family members and communication with health care providers. Within these two groupings, three themes emerged to describe cancer pain experiences and communication barriers: (1) We don’t talk about it, (2) Respect for healthcare providers; and (3) Culturally prohibitive topics on death and pain experiences. Not talking about their cancer diagnosis and cancer-related pain leaves many American Indian cancer survivors without much-needed social support, contributing to reduced treatment compliance and access to healthcare. Findings have implications for educational interventions and quality of life improvement for American Indian and other underrepresented communities.

Collaborative research between scientists and local community members is often required to collect needed study samples and inform the overall study. This is particularly true in Indigenous communities where local knowledge and practices are integral to data collection, analysis, and dissemination. This study reports on a traditional ecological knowledge (TEK) collaborative methodological approach utilized for data collection in this unique community. In collaboration with Diné (Navajo) tribal harvesters and leaders in northwestern New Mexico, participants were recruited utilizing chain-referral recruitment and selection from a preexisting cohort. The research examined the extent of metal(loid) contamination in the primary food chain in a uranium (U) mining impacted area. Key food chain items (sheep, squash, herbal tea plants), water, and livestock forage samples were collected and determined for metal(loid)s (cesium, cadmium, molybdenum, lead, thorium, U, vanadium, arsenic, and selenium). This paper reports on the five-step process employed that involved local Diné food harvesters incorporating indigenous TEK and practices with Western science-based knowledge and practices. The five steps of harvest-based monitoring are: (1) identify goal and research questions, (2) design the study according to Diné and scientific protocols, (3) determine respective collaborative roles during fieldwork, (4) implement the fieldwork, and (5) analyze and disseminate the findings. Collaborative work supported constructs of respectfulness, trust, kinship, enhanced communication, and provided better understanding of contamination by researchers, community members, and leaders. The study allowed for the collection of baseline data and realistic reassessment goal recommendations for the future.