Hunters and gatherers are often healther than agriculturalist with fewer diseases. Often diseases spread in sedentary situations. People living in one place with a denser population spread diseases, especially as humans discard their garbage around this same settlement. Hunters and gatherers have typically been stone-tool using and have relatively few material possessions. Because they are nomadic they cannot carry a lot of possessions with them.
Archaeology is often of hunters and gatherers.
All Palaeolithic and Mesolithic archaeology is of hunters and gatherers.