The number of cells in a human body is a surprisingly difficult number to pin down! It varies depending on several factors, including:

* Age: Children have fewer cells than adults.

* Size: Larger individuals have more cells.

* Health: Illnesses and conditions can affect cell count.

However, a generally accepted estimate is around 37.2 trillion cells.

This number comes from a 2016 study that used sophisticated techniques to analyze cell types and their proportions in the body.

Keep in mind, this is just an estimate, and the actual number could be higher or lower.