The idea of becoming biologically younger is increasingly popular.
But what does it actually mean?
Biological age is an attempt to describe how our bodies are aging compared with our chronological age. Different tests look at different biological changes. This means they do not always give the same answer.
There is also an important difference between biological age and the pace of aging.
Biological age asks, in simple terms: How old does the body appear biologically?
The pace of aging asks a different question: How quickly is the body changing over time?
This distinction matters when we look at nutrition.
Research suggests that moderate calorie restriction may slow one measure of the pace of biological aging. But other measures of biological age have not shown the same change.
So eating fewer calories has not been shown to make people biologically younger.
Instead, the more interesting possibility is that nutrition may influence how quickly some aging-related biological changes develop.
That is a very different idea from reversing aging.
It is also why changes in a single biological age test should be interpreted carefully. No single test captures the entire aging process.
Healthy aging depends on much more.
Metabolic and cardiovascular health matter. So do muscle and physical function, sleep, nutrition and other aspects of long-term health.
The aim should therefore not be to chase a lower biological age number.
The more meaningful goal is to support the biological processes that help us remain healthy and functional for longer.
