Senolysis: what it is, how it works, and the role of the Fasting Mimicking Diet in longevity

In recent years, longevity research has shifted its focus from individual organs to the cellular mechanisms that regulate ageing.
Among these, senolysis stands out as one of the most promising processes: the selective removal of damaged cells to support tissue renewal.

Within this framework, the ProLon Fasting Mimicking Diet—developed by Valter Longo, one of the world’s leading experts in longevity—emerges as a nutritional approach designed to trigger deep cellular repair and regeneration processes.

What is senolysis?

Senolysis is the process through which the body identifies and clears out senescent cells, supporting tissue renewal and long-term health.
These are cells that have stopped dividing in response to damage or stress but, crucially, are not eliminated as they should be.

They’re not simply “inactive.”
Senescent cells remain metabolically active and release a range of biochemical signals—known as SASP—that disrupt the surrounding environment, contributing to chronic inflammation and tissue deterioration.

From a biological perspective, senolysis relies on two key mechanisms:

·       activation of the immune system, which recognises and removes senescent cells

·       intracellular signals that trigger programmed cell death (apoptosis) in damaged cells

As we age, these processes become less efficient, leading to an accumulation of senescent cells—now considered one of the core drivers of biological ageing.

Why senolysis matters for longevity

An excess of senescent cells is linked to a less efficient and more vulnerable biological environment.
This condition—often referred to as inflammaging—affects multiple systems across the body.

Supporting senolysis means addressing the issue at its root, improving overall cellular function and contributing to better health over time.

Key benefits associated with enhanced senolytic activity include:

·       reduced chronic systemic inflammation

·       improved tissue and organ function

·       more efficient cellular regeneration processes

Autophagy: the key process behind senolysis

To understand the link between nutrition and senolysis, it’s essential to look at autophagy.

Autophagy is a cellular “self-cleaning” process where the cell identifies damaged components—such as dysfunctional proteins or organelles—isolates them, and breaks them down for recycling.

This process is regulated by specific metabolic pathways, including the inhibition of mTOR and the activation of AMPK, which are triggered under conditions of reduced energy intake.

In simple terms, it allows cells to maintain high efficiency even under stress, such as during calorie restriction.

Unlike senolysis, which removes entire cells, autophagy works at an intracellular level.
However, the two processes are closely connected: by improving internal cell quality, autophagy helps distinguish between cells that are still functional and those that are no longer viable, making their removal more efficient.

In this sense, it plays a crucial role in maintaining cellular balance and supporting longevity mechanisms.

The ProLon Fasting Mimicking Diet and senolysis

The ProLon Fasting Mimicking Diet is a five-day nutritional protocol designed to mimic the effects of fasting while still providing controlled nutrient intake.

During the programme—developed and studied in both academic and clinical settings, with evidence supporting its impact on metabolic markers and ageing processes—the body shifts into a metabolic state characterised by reduced levels of glucose, insulin, and growth factors such as IGF-1.

This shift activates a range of adaptive responses, pushing cells into a maintenance and repair mode.

Within this context, processes like autophagy are triggered, creating a biological environment that favours the selection of more efficient cells.
Damaged or underperforming cells become more vulnerable to clearance mechanisms, indirectly contributing to senolysis.

While it is not a direct senolytic intervention, the Fasting Mimicking Diet helps create the biological conditions that support cellular renewal and reduce the burden of senescent cells.

What can hinder senolysis?

Not all lifestyles support these processes.
In fact, certain everyday habits can slow down or impair the body’s ability to remove senescent cells.

Key factors that may hinder senolysis include:

·       diets high in refined sugars and ultra-processed foods

·       chronic calorie excess with no periods of nutritional restriction

·       sedentary behaviour and low physical activity

·       chronic stress and poor sleep quality

These conditions keep the body in a constant state of abundance and inflammation, reducing the activation of cellular repair and clearance mechanisms—and, over time, accelerating biological ageing.

Senolysis and longevity

Senolysis represents one of the most advanced frontiers in longevity science.

Targeting this process means acting directly on the mechanisms that drive ageing, rather than simply managing its effects.

Incorporating nutritional strategies such as the ProLon Fasting Mimicking Diet into a balanced lifestyle can help support these mechanisms in a natural and sustainable way.

The goal isn’t just to live longer—but to maintain a higher level of health and functionality for longer.