The influence of diet on the distribution of nitrogen isotopes in animals was investigated by analyzing animals grown in the laboratory on diets of constant nitrogen isotopic composition. 
The isotopic composition of the nitrogen in an animal reflects the nitrogen isotopic composition of its diet. The δ^(15)N values of the whole bodies of animals are usually more positive than those of their diets. Different individuals of a species raised on the same diet can have significantly different δ^(15)N values. The variability of the relationship between the δ^(15)N values of animals and their diets is greater for different species raised on the same diet than for the same species raised on different diets. Different tissues of mice are also enriched in ^(15)N relative to the diet, with the difference between the δ^(15)N values of a tissue and the diet depending on both the kind of tissue and the diet involved. The δ^(15)N values of collagen and chitin, biochemical components that are often preserved in fossil animal remains, are also related to the δ^(15)N value of the diet. 
The dependence of the δ^(15)N values of whole animals and their tissues and biochemical components on the δ^(15)N value of diet indicates that the isotopic composition of animal nitrogen can be used to obtain information about an animal's diet if its potential food sources had different δ^(15)N values. The nitrogen isotopic method of dietary analysis probably can be used to estimate the relative use of legumes vs non-legumes or of aquatic vs terrestrial organisms as food sources for extant and fossil animals. However, the method probably will not be applicable in those modern ecosystems in which the use of chemical fertilizers has influenced the distribution of nitrogen isotopes in food sources. 
The isotopic method of dietary analysis was used to reconstruct changes in the diet of the human population that occupied the Tehuacan Valley of Mexico over a 7000 yr span. Variations in the δ^(15)C and δ^(15)N values of bone collagen suggest that C_4 and/or CAM plants (presumably mostly corn) and legumes (presumably mostly beans) were introduced into the diet much earlier than suggested by conventional archaeological analysis.

Influence of Diet On the Distribtion of Nitrogen Isotopes in Animals

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Human Skeletal Remains Excavation Analysis Interpretation

‘Show me your teeth and I will tell you who you are’, Baron Georges Cuvier, the great eighteenth–nineteenth century zoologist and anatomist, is supposed to have said. This comment was really in the context of comparative anatomy, and refers to Cuvier's delight in reconstructing whole extinct animals from fossil fragments of their dentitions, but it will do just as well for human teeth. For anthropologists studying archaeological, fossil and forensic remains, the teeth are possibly the most valuable source of evidence in understanding the biology of ancient communities, following the course of evolution and identifying an individual from their fragmentary remains. Dental anthropology might therefore be defined as a study of people (and their close relatives) from the evidence provided by teeth. Teeth have a distinct anatomy and physiology, all their own and wholly different to the biology of the skeleton, and teeth are also unique amongst the resistant parts of archaeological and fossil remains in having been exposed on the surface of the body throughout life. Dental anthropology can therefore be studied in the mouths of living people, using much the same techniques as are employed for ancient remains. It is thus not surprising that practising dentists have always been prominent amongst dental anthropologists, with anatomists and other oral biologists from schools of dentistry, in addition to researchers whose training lies more in biological anthropology. The exposure of teeth in the living mouth is also very useful when training anthropologists, as everyone carries their own reference material with them – students can just open their mouths and look in a mirror.

Dental Anthropology: Introduction to dental anthropology

Introduction Part I: 1. The Steppe Highway: the rise of pastoral nomadism as a Eurasian phenomenon 2. Bronze, iron and gold: the evolution of nomadic cultures on the northern frontier of China Part II: 3. Beasts and birds: the historical context of early Chinese perceptions of northern peoples 4. Walls and horses: the beginning of historical contacts between horse-riding Nomads and Chinese states Part III: 5. Those who draw the bow: the rise of the Hsiung-nu Nomadic Empire and the political unification of the Nomads 6. From peace to war: China's shift from appeasement to military engagement Part IV: 7. In search of grass and water: ethnography and history of the North in the Historian's Records 8. Taming the North: the rationalization of the nomads in Ssu-ma Ch'ien's historical thought Conclusion.

Ancient China and its Enemies: The Rise of Nomadic Power in East Asian History . By Nicola Di Cosmo. Cambridge: Cambridge University Press, 2002. ix, 369 pp. $70.00 (cloth).

The two East Asian millets, broomcorn (Panicum miliaceum) and foxtail millet (Setaria italica), spread across Eurasia and became important crops by the second millennium BC. The earliest indisputab...

http://journals.sagepub.com/doi/pdf/10.1177/0959683616641742

Millet cultivation across Eurasia: Origins, spread, and the influence of seasonal climate

https://isiarticles.com/bundles/Article/pre/pdf/17124.pdf

Viktor Logvin

Papers

Subsistence and social change in central Eurasia: stable isotope analysis of populations spanning the Bronze Age transition

Dental health, diet, and social transformations in the Bronze Age: Comparative analysis of pastoral populations in northern Kazakhstan