Have you ever wondered how contact sports might impact your brain health? With the surge of awareness surrounding sports-related head injuries, both the scientific and clinical communities are looking for answers.
Omega-3s have been studied for their various health benefits, yet their role in brain health, particularly their effects on athletes playing contact sports, has been debated. With varying study outcomes and conflicting information available, distinguishing fact from fiction can be challenging. This article will explore the latest research on omega-3 fatty acids and their potential brain health benefits in contact sports, highlighting key findings that could shape how we approach athlete health and injury prevention.
Brain Injuries in Contact Sports
Traumatic brain injury (TBI) is defined as a form of acquired brain injury from a blow or jolt to the head or a penetrating head injury that disrupts the normal function of the brain. There are various types of TBIs, but in sports, concussions are the most common.
A concussion can be caused by a bump, blow, or jolt to the head and is common among contact sports such as American football, rugby, soccer, boxing, basketball, and hockey. The incidence of sports-related concussions (SRC) has continued to rise, particularly among younger athletes, even with advancements in sports policy, rules, and equipment.
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Common signs and symptoms associated with concussions are memory impairment, headache, and dizziness. Unfortunately, concussion reporting is often low, and some brain injuries in sports can go unnoticed.
An additional concern of contact sports is repetitive sub-concussive head impacts (rSHIs). These types of sub-concussive injuries appear asymptomatic but can lead to adverse effects on the brain over time. Even though rSHIs don’t display the common signs and symptoms of a concussion, they may elevate brain-derived blood biomarkers, which can be used to quantify the severity and recovery of these types of head injuries.
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Brain-Derived Biomarkers of Brain Injury
SRCs, also called mild TBI (mTBI), and rSHIs can lead to a complicated cascade of neurochemical and metabolic changes that affect brain function and recovery. The complexity of head injuries, including secondary mechanisms of injury resulting from excitotoxicity, oxidative stress, edema, neuroinflammation, and neuronal death, makes them challenging to diagnose.
Clinical decisions regarding diagnosis are often based on judgment and are primarily informed by subjective patient reporting. Therefore, researchers have been exploring the validity and use of biomarkers to detect concussions, which could allow point-of-care testing that could be used on the field or clinic to detect concussions and monitor progression and recovery objectively.
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Generally speaking, an inflammatory response occurs following head impact, which can be reflected in the increase in related biomarkers. Several potential brain-derived biomarkers of head injury have been identified, such as S100 calcium-binding protein B (S100B), glial fibrillary acidic protein (GFAP), and neurofilament-light (Nf-L).
Nf-L is a subtype of neurofilaments, structural proteins primarily found in neurons. After injury, Nf-L is released into the cerebrospinal fluid and will eventually enter the peripheral circulation, where it can be measured to detect neural damage. Importantly, it is sensitive enough to detect neuroaxonal injury following rSHI, where other signs or symptoms may be absent entirely. This has been observed across several studies that have reported a relationship between the degree of neural damage and the frequency and magnitude of head impacts and consequent elevations in Nf-L (1, 2, 3, 4, 5).
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How Omega-3s May Support and Protect an Athlete’s BrainÂ
While clinical care commonly focuses on diagnosis and treatment after a concussion, some scientists hypothesize that specific nutrition strategies may play crucial prophylactic roles in concussions, preventing or reducing the detrimental effects commonly seen in SRC and rSHI. Omega-3 fats, especially EPA and DHA, have been explored as nutrients that protect against or attenuate damage after these types of head injuries.
Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are omega-3 polyunsaturated fatty acids (PUFAs) that play essential roles in the brain’s structure and function. DHA, in particular, is a primary structural component of neuronal cell membranes and has been found to play essential roles in neurogenesis and maintaining the central nervous system.
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Omega-3 fats also benefit athletes’ brain health by exerting anti-inflammatory properties. In fact, EPA can be converted to various eicosanoids and DHA into docosanoids, which downregulate inflammatory responses and provide neuroprotection. Therefore, omega-3 fats have been linked to protecting against head trauma by suppressing the inflammatory response to injury, protecting neurons from cell death, and promoting neurogenesis.
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The Role of the Omega-3 Index in Brain HealthÂ
The Omega-3 Index, defined by the amount of EPA + DHA in red blood cell membranes expressed as a percentage of total fatty acids, reflects dietary fat consumption and omega-3 status. Furthermore, PUFA levels in the red blood cells mirror that composition found in cellular membranes of other major organs and tissues throughout the body.
The Omega-3 Index was initially discussed as a risk factor for death from coronary heart disease, with 8% or higher being recommended for protective effects and 4% or lower being linked to higher risk. However, more recently, it has been examined as an important measure of athlete health and performance.
A recent (2024) review described the roles of Omega-3 Index in elite and non-elite athletes. As previously understood, omega-3s can decrease the risk of cardiovascular disease (CVD) by improving membrane phospholipids and providing anti-inflammatory and anti-atherosclerotic effects. Even though CVD may not be a primary concern for young athletes, cardiovascular health plays a pivotal role in sports performance, and therefore, improving cardiovascular health could benefit all.
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The authors also discuss the effects of the Omega-3 Index on sports injury prevention, including head injury. They reported that an optimal Omega-3 Index may help mitigate or prevent head injuries by regulating the immune system and improving the inflammatory response to initial trauma. Based on the available evidence, the authors conclude that achieving and maintaining Omega-3 Index levels >8% could help reduce cardiovascular risk, mitigate brain and inflammation-induced injury, and optimize performance in athletes.
Furthermore, while studies are limited, some scientists have explored the effects of omega-3 interventions on the prevention of neurotrauma from rSHI in athletes throughout sports seasons. Some studies (1, 2) found that omega-3s prevented elevations in Nf-L compared to placebo throughout a football season. But, not all studies have demonstrated measurable benefits of omega-3s on brain biomarkers of neurotrauma. Furthermore, despite the preliminary data, researchers only recently conducted a meta-analysis investigating the relationship between omega-3s and brain-derived blood biomarkers in athletes exposed to rSHI.
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New Systematic Review on Omega-3s and Brain Health in Contact Sports
A systematic review and meta-analysis, published last September, was conducted to determine the effect of omega-3 PUFA supplementation on Nf-L concentrations in contact sport athletes regularly exposed to rSHI. Although, based on inclusion criteria, only three studies were included in the analysis, the data indicated that omega-3 supplementation attenuates increases in Nf-L throughout a sports season. More specifically, the findings support omega-3 supplementation, including at least 2g/d of DHA for the prophylactic support of contact sport athletes typically exposed to rSHI.
Notably, the researchers report that the difference in serum Nf-L concentrations between those with supplementation and those without increases over time, highlighting the importance of omega-3s incorporated into cellular membranes for brain health protection. Furthermore, the researchers stress that given the limited number of studies available, these findings should be considered preliminary rather than conclusive and that more carefully designed research studies are needed before definitive conclusions can be made.
Nonetheless, this meta-analysis adds important evidence connecting nutrition and brain health and again highlights the potential benefits of increasing the Omega-3 Index in athlete populations.
Recent data suggests that omega-3 status is low in most athletes. Furthermore, various factors, such as training intensity and volume, can impact Omega-3 Index levels in athletes. Due to these training-related changes in PUFAs, athletes may need to alter typical omega-3 intake and recommendations to meet the higher demands of intense physical activity. In future studies, information regarding changes in the Omega-3 Index can provide insight into compliance and effectiveness of supplementation and, potentially, an ideal Omega-3 Index value for protection from head injury.
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Summary
There is growing concern about the incidence and long-term effects of SRC and rSHI in contact sport athletes. To attenuate the acute and chronic damage related to head injury, scientists have been looking for ways to increase protection prophylactically.
Among the possible methods, omega-3 fats have been identified as a potential nutrient intervention to attenuate head injury. Data suggests athletes consume inadequate amounts of EPA and DHA to support health and performance. Therefore, athletes may benefit from increasing intake of EPA and DHA due to their various effects, such as controlling inflammation, supporting nervous system function, and improving training adaptation.
While more research is needed to provide definitive guidance on the validity and use of omega-3s to prophylactically attenuate damage from concussion and rSHI, given the low risk of DHA and EPA consumption, athletes may wish to consider increasing intake to maintain an optimal Omega-3 Index of 8%.
