Have you ever experienced symptoms like these?

• Thinking more slowly

• Having difficulty remembering what you just did

• Reading information but not fully understanding it

• Lack of focus

• Feeling like your brain is not working at full capacity

These symptoms are often referred to as Brain Fog or “mental fatigue.”

Brain Fog is not a medical disease by itself, but a term used to describe a group of symptoms related to brain function and thinking, such as:

• Reduced concentration

• Temporary memory decline

• Unclear thinking

• Mental tiredness

Especially in today’s world, where many people have to:

• Work in front of screens for long periods

• Receive large amounts of information throughout the day

• Multitask frequently

• Get insufficient rest

This can make Brain Fog more common.

Why Do We Feel Mentally Fatigued? 

1. Insufficient Sleep or Poor Sleep Quality

Sleep is an important period when the brain restores itself.

During sleep, the brain:

• Organizes information and memories

• Restores nervous system function

• Clears waste products from metabolic processes

When rest is insufficient, it may affect:

• Focus

• Decision-making

• Memory

• Mood

People who consistently sleep too little may feel as if their brain works more slowly during the day.

Research published in Nature Reviews Neuroscience, 2017 found that sleep plays an important role in learning, memory, and brain function.

2. Accumulated Stress Can Make the Brain Work Too Hard 

Short-term stress may help us stay alert and solve problems better.

However, when stress continues over time, it may affect the nervous system and hormones, such as:

• Cortisol

• The stress response system

Accumulated stress may lead to feelings such as:

• Difficulty thinking clearly

• Fatigue

• Lack of motivation

• Reduced focus

Research published in Nature Reviews Neuroscience, 2009 found that chronic stress can affect the structure and function of certain brain areas related to memory and emotional regulation.

3. Using the Brain Continuously Without Breaks 

The brain does not become tired only from thinking. It also becomes tired from processing too much information.

Examples include:

• Opening multiple screens at the same time

• Constantly switching between tasks

• Having back-to-back meetings

• Receiving frequent phone notifications

These increase cognitive load.

Simple ways to help include:

• Focus on one task at a time

• Take breaks from screens

• Create periods when you do not receive new information

4. Lack of Movement During the Day 

Many people work at a desk for 8–10 hours per day, causing the body to move very little.

Exercise supports the brain through several mechanisms, such as:

• Increasing blood flow to the brain

• Stimulating factors related to nerve cell function

• Helping reduce stress

Even simple activities such as:

• Brisk walking for 20–30 minutes

• Stretching during the day

• Light exercise

can help increase physical activity.

Research published in Neurology, 2022 found that physical activity is associated with brain health and slower cognitive decline.

How Can You Improve Brain Fog? 

1. Prioritize Sleep

The most basic foundation for brain recovery is sleep.

Simple guidelines include:

• Go to bed and wake up at similar times

• Reduce screen light before bed

• Avoid caffeine in the evening

• Create a bedtime routine

A general goal for adults is around:

7–9 hours per night

2. Fuel the Brain with the Right Foods

The brain needs energy and nutrients to function.

Interesting nutrients include:

Omega-3

DHA, in particular, plays a role in the structure of brain cells.

Food sources:

• Fatty fish

• Fish oil

Vitamin B Complex

Involved in:

• Energy production

• Nervous system function

Especially:

• B1

• B6

• B12

• Folate

Magnesium

Related to:

• Nerve signaling

• Nervous system balance

Antioxidants

Such as:

• Vitamin C

• Polyphenols

• Flavonoids

These help protect cells from oxidative stress.

3. Use the Pomodoro Technique to Reduce Mental Load

Instead of working for many hours continuously, try dividing your time into blocks, such as:

• Work for 25–50 minutes

• Rest for 5–10 minutes

During breaks, you should:

• Stand up and walk

• Look away from the screen

• Stretch your muscles

This helps the brain reset during the day.

4. Let the Brain Truly Rest 

Resting does not mean switching from a computer to a phone.

That still keeps the brain receiving information continuously.

Try activities such as:

• Taking a walk

• Listening to music

• Practicing breathing

• Spending time in nature

• Meditating

Research published in JAMA Internal Medicine, 2014 found that Mindfulness Meditation may help reduce stress and support mental well-being.

5. Exercise to Stimulate the Brain

Exercise does not only benefit the body. It also supports the brain.

Suitable activities include:

• Brisk walking

• Light jogging

• Cycling

• Weight training

General goal:

At least 150 minutes per week, according to the World Health Organization’s recommendation.

Nutrients Gaining Attention for Brain Health 

In addition to general foods, some nutrients have been studied in relation to brain health, such as:

L-Theanine

A compound from green tea that has been studied in relation to relaxation and focus.

Phosphatidyl Serine

A component of nerve cell membranes that has gained attention for memory support.

Creatine

Besides its role in muscles, Creatine has also been studied in relation to brain energy.

NADH

Involved in cellular energy production processes.

When Should You Consult a Professional? 

If you experience abnormal symptoms such as:

• Brain fog that continues for a long time

• Clearly worsening memory

• Confusion

• Symptoms that affect daily life

You should consult a doctor or healthcare professional to investigate the underlying cause.

Summary 

Brain Fog can be caused by many factors, including:

✅ Insufficient sleep
✅ Accumulated stress
✅ Excessive mental workload
✅ Lack of movement
✅ Insufficient nutrient intake

The best way to support brain recovery is to take care of multiple areas together:

• Get enough sleep

• Eat a balanced diet

• Exercise regularly

• Reduce stress

• Give the brain time to rest

A well-functioning brain does not come from forcing yourself to work harder. It comes from knowing how to recover properly.

References 

• Rasch B, Born J. “About sleep’s role in memory.” Physiological Reviews, 2013

• McEwen BS. “Stress and hippocampal plasticity.” Nature Reviews Neuroscience, 2009

• Gomez-Pinilla F. “Brain foods: the effects of nutrients on brain function.” Nature Reviews Neuroscience, 2008

• Goyal M, et al. “Meditation Programs for Psychological Stress and Well-being.” JAMA Internal Medicine, 2014

• World Health Organization. “Guidelines on Physical Activity and Sedentary Behaviour.” WHO, 2020

• Erickson KI, et al. “Physical activity, cognition, and brain health.” Neurology, 2022