The Man Found In A Melting Glacier — And The DNA Test That Found 17 Living Relatives Centuries Later
Different food sources leave different isotopic signatures in the body tissues of the organisms that consume them.
Marine foods — fish, shellfish, marine mammals — have distinctive carbon and nitrogen isotope ratios that differ from the ratios left by terrestrial foods.
Freshwater fish fall between the marine and purely terrestrial signatures.
The specific ratios in a person’s tissues thus reflect the diet that built those tissues — and because different tissues are built at different rates, the analysis of different tissue types can reveal dietary patterns at different time scales.
Bone collagen, which builds up over years, reflects the long-term average diet.
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