Adults and kids all struggle to varying degrees on paying attention, whether that’s in a classroom, place of work, or simply trying to watch a movie. While some experts blame too much screen time, poor sleep quality, or stress, there is another factor that is often overlooked: diet.
You probably have felt hangry at some point, where you’re hungry and it’s making you cranky and irritable. This is a great example of how food, or lack thereof, can have an immediate and noticeable impact on your emotional health. Certain dietary patterns may also have long-term effects, especially when it comes to attention, focus, and mood.
Emerging research suggests that dairy products and high intakes of saturated fat from animal sources may contribute to symptoms related to ADHD, cognitive performance, inflammation, sleep disruption, and mood. While nutrition is not the sole cause of ADHD or other conditions, evidence increasingly supports the idea that dietary patterns can significantly influence brain function and behavior.
The Connection Between Dairy and ADHD
Dairy proteins are a hot topic for many people looking to bulk up or slim down, but how are they affecting your body beyond vanity? One of the proteins most prevalent in dairy products is casein, which may be the culprit to any negative effects. During digestion, casein can break down into compounds called casomorphins, which are opioid-like peptides that can interact with receptors in the brain. These compounds may contribute to symptoms such as:
- Brain fog
- Irritability
- Aggression
- Difficulty concentrating
- Emotional dysregulation
Children may be especially vulnerable because their digestive systems and intestinal barriers are still developing. According to a recent study, opioid-like compounds from dairy may more easily pass into the bloodstream and potentially affect neurological signaling in children (1).
A study examining children with neurodevelopmental disorders, including ADHD, found significantly higher urinary levels of casomorphin-8, an opioid-like byproduct of cow’s milk digestion (2). Researchers proposed that incomplete digestion of casein could contribute to neurological and neuropsychiatric symptoms.
While more research is needed, these studies raise important points about how specific foods and proteins may negatively affect ADHD symptoms.
Dairy, Saturated Fat, and Brain Inflammation
Although our society is fixated on protein, it’s not the only macronutrient in dairy products that may be problematic. The fat in dairy products is up to 70% saturated, which is associated with concerns like raising the risk of heart disease and stroke. But what about other effects on the brain and body?
Research shows saturated fats can activate immune cells in the brain and promote neuroinflammation, which may negatively affect memory, focus, and learning ability (3,4). These cognitive effects may occur after relatively short-term exposure to high saturated fat diets. Many dairy products, especially cheese, butter, ice cream, and whole milk, are major sources of saturated fat in the Western diet, potentially influencing cognition.
The Impact of Dairy on Mood and Depression
Mental health is another important part of our wellbeing that may be influenced by dietary decisions.
A study of adolescent girls found that higher intake of full-fat dairy products was associated with significantly higher depression scores (5). In contrast, dietary patterns rich in fruits, vegetables, and other plant foods were associated with lower depression symptoms.
While researchers cannot confidently say dairy directly causes depression, these findings align with broader evidence showing that anti-inflammatory, plant-forward diets tend to support better mental health outcomes.
Sleep, Focus, and Emotional Regulation
Tossing and turning all night? Your diet might be contributing, which has cascading effects on your attention span, memory, mood, and emotional regulation.
Research shows that high dairy intake is associated with more nighttime awakenings in children (6). Diets high in saturated fat are also linked to poorer sleep quality among children and adolescents (7).
When children lose restorative deep sleep, symptoms that resemble or worsen ADHD can become exacerbated.
Eliminating Dairy
Whenever someone has an intolerance, eliminating the trigger food should resolve any problems. It’s more difficult to identify triggers with mental health symptoms that are more complex and may not be immediately felt, so looking at the available evidence provides a starting point.
A landmark randomized controlled trial found that approximately 80% of children with ADHD experienced substantial behavioral improvements after following a restricted elimination diet that removed common trigger foods, including dairy (8). The control group showed minimal improvement, while the elimination diet group demonstrated significant reductions in ADHD symptoms.
Another study found that removing dairy, gluten, and eggs was associated with improved scores on the Conners Parent Rating Scale, a standardized ADHD behavioral assessment tool (9).
An elimination diet is not a substitute for a medical assessment, but removing dairy may be a strategy to help manage symptoms and improve quality of life, especially when paired with other strategies.
Solutions
Struggling with mental health in any way can be frustrating to say the least. While dietary changes should not be traded for qualified medical evaluation and care, it can be one tool in your toolbox and may lead to noticeable improvements. Why not give it a try?
Diets centered around whole plant foods, and therefore avoiding dairy and animal products, may offer protective benefits. A study involving 345 children found that those consuming the most plant-based diets were 68% less likely to have ADHD diagnoses compared to those consuming the least plant-based diets (10).
Researchers believe plant foods may help reduce oxidative stress and inflammation, both of which are increasingly linked to ADHD and mental health conditions. Additionally, plant-based diets have antioxidants, phytonutrients, and fiber that will boost your overall health and wellbeing.
Our takeaway advice? It’s worth exploring whether removing dairy products from your diet and replacing them with plant-based foods leads to noticeable changes in your mental health and ability to focus, and it’s nearly guaranteed to make you feel better physically.
