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Fontes-Villalba et al. (1) correctly observe that carbon isotope ratios in tooth enamel do not speak directly to plant versus animal food ingestion. Carbon isotope ratio data are useful for quantifying the consumption of C3- or C4-derived carbon, whether it comes directly from C3 or C4 plants or indirectly through consumption of animals that eat those plants. Not only do we acknowledge as much in our recent series of papers, but we have made this point in print many times over the past two decades (ref. 2 and references therein). However, to what extent can we speak to animal food consumption by early hominins? To address this question, we first note that “early hominin diet” is a convenient abstraction …

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