The science of gerontology has evolved as longevity has improved. Researchers in this field are diverse and are trained in areas such as physiology, social science, psychology, public health, and policy. A more complete definition of gerontology includes all of the following:
Smelly bowel movements are caused by the release of gas. when bacteria, bile or acid mixes with food. Depending on the. food you eat, and where in your digestive tract the mixing. occurs, the combinations can produce various types of gas, all. with different smells.
When it comes to frequency, color, shape, and size, a general rule of thumb is that normal bowel movements are defined as whatâs comfortable for you. But being knowledgeable about your digestive process can help you identify when normal goes awry.olor can be a red flag when itâs a drastic change, Aserkoff says. âIf stool is black, it can mean that you are bleeding internally, possibly as a result of an ulcer or cancer ,â he says. Stool that is black due to bleeding is also sticky (tarry) and smells bad.