The ability of muscle to remain efficient, recover after exertion and repair itself following trauma also depends on the activity of highly specialized cells: human skeletal muscle progenitor cells, known as hMPCs.
These cells act as a biological emergency reserve. They remain inactive until the body sends signals linked to stress, damage or injury. At that point, they come into action, multiply and contribute to the reconstruction of damaged muscle fibers.
With age, or in the presence of unfavorable lifestyle habits, this capacity may decline. The result is slower recovery, reduced muscle efficiency and, over time, a tangible impact on quality of life. Scientific research is showing with increasing clarity that the environment in which these cells live, namely the set of circulating factors in the blood, can decisively influence their behavior. In this context, blueberries come into play as a food of particular interest.
The study: six weeks on a blueberry-enriched diet
A recent clinical study evaluated the effects of a blueberry-enriched diet, referred to as BED, on the functionality of muscle progenitor cells.
The research involved women from two different age groups: a younger group, aged 21 to 40, and an older group, aged 60 to 79.
The protocol involved the daily intake of 38 grams of freeze-dried blueberry powder for six weeks. This amount, comparable to a substantial serving of fresh fruit, was used to determine whether blood serum, modified by the metabolized nutrients from blueberries, could influence the behavior of muscle cells observed in the laboratory.
Muscle regeneration: cell growth up to 40%
The most significant results were observed in the group of younger women. After six weeks of regular blueberry consumption, serum collected from the participants showed a greater ability to stimulate muscle cell activity.
The clearest finding concerned cell proliferation: the number of progenitor cells increased by an average of 40% compared with baseline values. In other words, blood enriched with blueberry-derived compounds created a more favorable biological environment for the growth and repair of muscle tissue.
Cell metabolism also showed positive signs. The researchers recorded an increase in oxygen consumption of up to 36%, a parameter associated with greater cellular vitality and improved energy management capacity, both of which are essential in recovery processes after stress or injury.
A further element concerned resistance to oxidative stress. The study highlighted a trend toward a reduction in induced cell death, equal to around 12%. This suggests that blueberries may help create more protective conditions for cells involved in regeneration.
Effects linked to consistency, not a single intake
An important aspect emerging from the research is that the benefits did not appear after a single intake. The most relevant effects became visible only after six weeks of daily consumption.
This finding reinforces a key principle of nutrition: to obtain measurable biological responses, regularity may be more important than occasional intake. In the case of blueberries, consistency appears to help modify over time the circulating environment in the blood, making it more favorable to muscle cell activity.
Age and biological response: different results after 60
The study also highlighted a difference between the generations involved. In the group of women aged 60 to 79, the same immediate effects on the proliferation of progenitor cells were not observed.
This result does not necessarily indicate a lack of benefit from blueberries in older people. Rather, it suggests that as age advances, muscle regeneration mechanisms become more complex and may respond differently to nutritional stimuli.
The causes may be linked to a different metabolism of the bioactive compounds found in berries, or to a lower sensitivity of mature cells to circulating signals in the blood. This remains an open area of research, requiring further studies to understand how nutritional intake can be adapted to different stages of life.
The value of whole foods
The research also indicated that the effect of blueberries on cell proliferation does not appear to depend on a single enzyme, such as SIRT1, but on a broader combination of circulating factors modified by regular consumption of the fruit.
This point is particularly relevant: the benefit would not be linked to a single isolated molecule, but to the complexity of the whole food and the interactions its compounds generate within the body.
A new perspective for nutrition and muscle recovery
The study represents one of the first demonstrations in humans that a dietary intervention can modify blood serum to the point of directly influencing the function of muscle stem cells.
For the berry sector, and particularly for blueberries, this is a highly interesting signal: beyond the established positioning linked to antioxidants, taste and general well-being, a more specific perspective is opening up on the potential role of these fruits in muscle recovery and regeneration processes.
Research will now need to clarify how these effects may vary according to age, physical condition and duration of supplementation. But the message that emerges is already clear: regularly including blueberries in the diet may help create a more favorable biological environment for muscle health.
Source: Blum JE, Gheller BJ, Hwang S, Bender E, Gheller M, Thalacker-Mercer AE. Consumption of a Blueberry-Enriched Diet by Women for 6 Weeks Alters Determinants of Human Muscle Progenitor Cell Function. J Nutr. 2020 Sep 1;150(9):2412-2418. doi: 10.1093/jn/nxaa190. PMID: 32678436.
Image source: Unsplash
🫐 Well-being & Health with Berries 🍓This article is part of the editorial series Wellness & Health with Berries, which brings scientific research closer to everyday life, promoting berries as allies for well-being. The series offers clear, up-to-date, and evidence-based content designed to inform consumers and support all operators in the berry supply chain. |
