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More modern analyses using stable isotope measurements have allowed scientists to study bone collagen collected from Tollund Man to determine his diet as being terrestrial-based. Their teeth also indicate their age at death and what type of food they ate throughout their lifetime. Dental caries, which are cavities within teeth, can direct archaeologist toward a persons diet prior to their death. Unlike erosion that the teeth may undergo due to decay, dental caries are typically sharp and well defined cavities that have a larger diameter than erosion that occurs after death. Significant rates of dental caries point to diets that are rich in carbohydrates and can lead archaeologists to differentiate between plant-based diets and protein-based diets (animal protein is non-cariogenic). Dental enamel defects known as hypoplasias can also be seen in the analysis of teeth and can point towards malnutrition as well as diseases. The Subsurface radar, also known as ground penetrating radar (GPR) can be used in archaeological investigation to map features beneath the ground to reconstruct 3D visualizations. As it pertains to bog bodies, GRP can be used to detect bodies and artifacts beneath the bog surface before cutting into the peat.