Along with exercising, hydrating, and getting enough sleep, the foods you eat play an essential role in keeping your energy levels high.
As such, you may wonder which foods may help maintain your alertness and focus throughout the day.
This article explains whether certain foods can boost your energy levels.
The first thing you need to know is that all foods give you energy in the form of calories, which are a measure of energy.
One calorie measures the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius (
That said, not all foods affect your energy levels the same way.
Of the three macronutrients, carbohydrates provide a faster energy source compared with proteins and fats, as they’re your body’s preferred source of energy (
Nevertheless, carbs are categorized as simple and complex, as well as having a high or low glycemic index (GI). And once again, they affect your energy levels differently.
Simple vs. complex carbs
Simple carbs comprise either one or two sugar molecules, and they’re known as either monosaccharides and disaccharides, respectively. Because their structure is so small, they’re easier to digest and thus easily used for energy.
However, their fast digestion rate means that they cause a rapid rise in your blood sugar levels — and consequently your energy levels — which is usually followed by a crash that may leave you feeling sluggish (
Some examples of simple carbs you might want to limit to avoid such an effect include white bread, breakfast cereals, candy, fruit juice, and processed or refined grains with added sugars.
Since their structure is more complex and they’re usually fiber-rich, they take longer to digest and thus provide a gradual increase in your blood sugar levels (
This means that complex carbs provide you with a steady supply of energy throughout the day.
Examples of complex-carb food sources you could try to include in your diet include unrefined whole grains, oats, legumes, and starches.
Foods with a high GI tend to spike and then crash your blood sugar levels, much like simple carbs. In contrast, foods with a low GI — like complex carbs — aren’t known to cause abrupt variations in your blood sugar levels (
Research shows that high GI diets, which are high in sugars and low in fiber, are associated with reduced alertness and increased sleepiness (
The GI of foods may be especially relevant in the case of whole fruit and dairy.
Structurally, the carbs in fruit and dairy — fructose and lactose, respectively — are simple. Yet, they’re both nutrient rich, low GI foods that may provide a quick energy source without sacrificing your diet quality (
Nevertheless, keep in mind that fruit juices and flavored dairy products tend to have added sugars, and therefore a high GI.
Carbs provide a faster energy source compared with proteins and fats. Simple or high GI carbs tend to spike and then crash your energy levels. Complex or low GI carbs ensure a steady energy supply throughout the day.
Caffeine-containing foods and beverages such as coffee, tea, caffeinated sodas, energy drinks, matcha, chocolate, guarana, and yerba mate may also help reduce symptoms of fatigue and improve alertness and vigilance (
Adenosine is a compound with sleep-promoting effects, while dopamine and noradrenaline are two chemical substances that stimulate your heart and central nervous system, thus increasing alertness and focus (
Nevertheless, be mindful about the type of caffeinated products you choose. Some of them, such as energy drinks and caffeinated sodas, tend to be high in added sugars, which may increase the risk of obesity, type 2 diabetes, and heart disease (
Plus, while caffeine intake is generally recognized as safe, some people may experience side effects upon caffeine consumption, with symptoms ranging from mild to severe. Symptoms may include anxiety, restlessness, insomnia, irregular heart rate, and tremors (
Caffeine-containing foods and beverages may also help reduce fatigue and improve alertness. However, while caffeine is generally recognized as safe, some people may experience mild to severe side effects.
Exercising, hydrating, and getting enough sleep are also key to increasing your energy levels.
Aim to meet physical activity recommendations
In fact, exercise is often recommended as part of the treatment for chronic fatigue syndrome — a condition characterized by long‐lasting fatigue, joint pain, headaches, sleep problems, poor concentration, and short‐term memory problems (
Current Physical Activity Guidelines for Americans recommend that adults get 150–500 minutes (2.5–5 hours) of moderate intensity aerobic physical activity per week, such as jogging, dancing, swimming, and biking (
If you’re currently physically inactive, consider starting with lower intensity activities and gradually increasing the frequency and duration of your workouts.
Strive to stay properly hydrated
Hydrating properly during the day could give you an energy boost and help fight feelings of fatigue.
According to the Institute of Medicine, men need about 15.5 cups (3.7 liters) of water per day, while women need 11.5 cups (2.7 liters) a day. However, your needs may change depending upon the climate and your physical activity levels (
One easy way to stay on top of your hydration status is by monitoring your urine color. A clear or pale color is a good indicator of optimal hydration (17).
Get ample sleep
Your body needs sleep for energy restoration and conservation. Thus, sleep deprivation caused by inadequate sleep leads to decreased alertness, performance, and an overall deterioration in health (
Unfortunately, poor sleep health is a common denominator in today’s overworked and overstimulated society, with roughly a third of Americans sleeping less than the recommended 7 hours for adults ages 18–60 (
Adequate sleep will not only improve your energy levels but also potentially your overall health and quality of life.
Staying on top of your physical activity levels, hydration, and sleep will also help reduce tiredness and keep you feeling energized during the day.
While all foods provide energy, eating a wholesome diet rich in complex carbs may be the best way to avoid energy crashes throughout the day.
In addition, be sure to accompany a well-balanced diet with enough exercise, hydration, and ample sleep to improve your energy levels and reduce fatigue.
Nevertheless, consider talking with a healthcare professional if you’re experiencing serious or prolonged fatigue.