Modern medicine is only beginning to develop a unified theory of aging, as age-related changes are highly complex, multifactorial, and individual. However, a major breakthrough came in 2016, when Japanese scientist Yoshinori Ohsumi received the Nobel Prize in Physiology or Medicine for his discovery and research on autophagy. Autophagy—literally “self-eating”—is the process by which cells cleanse themselves of biological waste: damaged organelles, partially denatured proteins, incomplete metabolic byproducts, toxins, and pathogens. It is a beneficial and efficient mechanism: unnecessary structures are broken down safely, and their components are reused to build new ones. When autophagy is insufficient, remnants of dead cells accumulate, triggering inflammation. Autophagy is especially important in fully differentiated cells such as cardiomyocytes and neurons; therefore, disturbances in autophagy contribute significantly to age-related disorders, including cardiovascular and neurodegenerative diseases like Alzheimer’s.
Fasting to Stay Younger
One way to stimulate autophagy is calorie restriction. For centuries, controlled fasting has been known to support healthy aging, a fact now confirmed by extensive scientific research. Caloric stress forces the body to mobilize internal reserves by “reviewing” and breaking down unused cellular components. Autophagy not only clears debris and lowers inflammation but also releases additional energy.
Today, researchers are actively searching for calorie restriction mimetics—substances that mimic the benefits of fasting without its discomfort.
Spermidine: A New Role for a Long-Known Molecule
Spermidine, a polyamine compound synthesized from amino acids such as arginine, is one of the key regulators of autophagy. Although first discovered in the 17th century in semen (hence its name), it is now known to be present in every living cell.
Studies show that spermidine enhances autophagy, helping cells live longer and stay healthier. A classic 2010 study by Frank Madeo demonstrated that adding spermidine to the diet of nematodes and fruit flies increased lifespan by 15–20%, findings later confirmed in mammals.
https://pubmed.ncbi.nlm.nih.gov/20110777/
Beyond promoting autophagy, spermidine also: Protects DNA, reducing the risk of mutations, Acts as an antioxidant, combating oxidative stress, helps modulate inflammation, lowering chronic inflammatory processes linked to heart and brain diseases
Neuroprotective Effects of Spermidine
Spermidine has been shown to reduce beta-amyloid accumulation—the protein that forms plaques in Alzheimer’s disease—by stimulating autophagy. Higher spermidine levels are associated with improved cognitive function in older adults. It also supports memory and may reduce the risk of depression by influencing neurotransmitter balance.
Spermidine and Healthy Longevity
Large observational studies show that spermidine production in the body declines with age. Interestingly, some healthy centenarians maintain spermidine levels comparable to those of much younger individuals. Research comparing the diets of elderly groups found that those who consumed the most spermidine-rich foods lived several years longer. Higher spermidine levels in the blood correlate with reduced mortality from cardiovascular disease and cancer. Spermidine also activates longevity-associated genes such as SIRT1, mimicking the effects of calorie restriction.
Where to Get It
If your body lacks spermidine, it can be obtained through diet. Japanese fermented natto is the richest source, followed by shiitake mushrooms, aged cheeses, and wheat germ. A reliable way to ensure adequate intake is through high-quality dietary supplements.
Spermidin Spirucell is a complete plant-based source of spermidine, suitable for vegans. Produced by the reputable German manufacturer Sanatur, it is made under strict control from organic wheat germ and organic buckwheat. Taking two capsules twice daily provides 0.8 mg of spermidine.
