Maize is a cultigen of global economic importance, but when it first became a staple grain in the Americas, was unknown and contested. Here, we report direct isotopic dietary evidence from 52 radiocarbon-dated human skeletons from two remarkably well-preserved rock-shelter contexts in the Maya Mountains of Belize spanning the past 10,000 years. Individuals dating before ~4700 calendar years before present (cal B.P.) show no clear evidence for the consumption of maize. Evidence for substantial maize consumption (~30% of total diet) appears in some individuals between 4700 and 4000 cal B.P. Isotopic evidence after 4000 cal B.P. indicates that maize became a persistently used staple grain comparable in dietary significance to later maize agriculturalists in the region (>70% of total diet). These data provide the earliest definitive evidence for maize as a staple grain in the Americas.

Teotihuacan's Tlajinga district is a cluster of neighborhoods on the southern periphery of the city best known for earlier investigations at Compound 33:S3W1. New research includes excavations at two other apartment compounds and along the southern extension of the Street of the Dead. Excavation contexts, major finds, chronology, and preliminary interpretations are the subject of this article. We highlight evidence attesting to a major obsidian-blade workshop at Compound 17:S3E1, offerings, and other features at that compound and Compound 18:S3E1, and the tempo and processes of urbanization viewed through well-recorded stratigraphic sequences of the compounds and the Street of the Dead. We conclude that significant occupation began in the Miccaotli phase, but it was not until some point in the Early Tlamimilolpa phase that the dominant housing type became apartment compounds; the continuation of the axis of Street of the Dead in the district was accomplished by excavating in the volcanic tuft substrate (tepetate) and could have been undertaken by the inhabitants of the district themselves; and the presence of items such as a sculpted stone face, marine shell, and polychrome pottery demonstrates that commoners at Teotihuacan enjoyed some access to finer items within the interregional economy.

Altica is a rare first-farming village site in the Basin of Mexico that has survived to modern times. Thus, it provides a glimpse into life during the Early–Middle Formative period. While valuable archaeological information on the village was recovered in excavation, only four burials comprising four individuals were recovered, a very small sample. Two individuals are older-aged females; the third, a middle-aged male, was accompanied by prestigious nonperishable goods and indicates that there are status differences even at this early date. The final individual was a young male buried in a deviant manner, suggesting possible foul play. While all individuals have indicators of periods of poor health, stable isotopes of carbon and nitrogen paint a more complete picture of the types of foods these individuals consumed over their lifetime. Radiogenic strontium isotopes of tooth enamel identify one individual, the young male buried in a deviant manner, as non-native to the Altica region. Thus, there is mystery in the manner of death, but even in this small sample, the wider connections Altica had that are so evident in the artefactual analysis are found in the skeletons. In addition, accelerator mass spectrometry radiocarbon dating provides a chronology of occupation through the people.

Skeletal remains from Tlajinga 33 (33:S3W1) have been the focus of research in the southern sector of Teotihuacan since excavations took place in the 1980s. Recent excavations in Tlajinga Compounds 17 and 18 (17:S3E1 and 18:S3E1, respectively), located along the southern Street of the Dead, recovered nine additional skeletons. This article is a description of the burials from Compounds 17 and 18 and a comparative analysis of health, diet, and chronology across all three compounds (Compounds 17, 18, and 33). Here, we test the hypothesis that individuals between residential compounds at Tlajinga lived similar lives and that health and biogeochemical markers of individuals will reflect these similarities. Although the sample size is small, the paleopathological analysis of individuals at Compounds 17 and 18 indicates morbidity patterns similar to Tlajinga 33, but also that these residents were perhaps less susceptible to stressors during periods of juvenile growth. Stable carbon and nitrogen isotopes suggest that, overall, diets were analogous across compounds, but Compounds 17 and 18 were able to supplement their diet with a greater variety of plant resources. There were no clear dietary differences between higher and lower status individuals, however. Finally, accelerated mass spectrometry radiocarbon (AMS 14C) dates indicate that residential living may have occurred later at Compound 18 than at Compound 17 and Tlajinga 33.

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