What foods are being consumed?
What is the geographical origin of that food?
What is the isotopic input of certain food types?
How and at what rate are foods metabolized?
What is the residence time of metabolites in the body?
Do proteins break down and reform during digestion, or do they remain intact?
How much and how quickly is ingested carbon (as protein) lost during breathing? Through excretion? Through perspiration?
Water balance and turnover
What is the residence time of water in the body?
How does this change in times of stress?
Where did this individual spend his/her youth?
Where has this individual been recently?
Do preferred food sources change annually? Seasonally?
In response to climate or other external changes?
Where do these animals go when we cannot find them?
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