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Diet and Exercise and Sleep

Rob Newsom

Written by

Rob Newsom, Staff Writer

Dr. Anis Rehman

Medically Reviewed by

Dr. Anis Rehman, Endocrinologist

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Diet, exercise, and sleep are three pillars of a healthy life. While improving just one of these lifestyle factors can help people lead longer lives, several recent studies have suggested that improving all three may be a better way to improve both physical and mental health.

The Relationship Between Diet, Exercise, and Sleep

Diet, exercise, and sleep influence one another in complex and innumerable ways. Learning about how these activities affect one another is an important part of understanding why research has shown that the more of these lifestyle behaviors you improve, the better your well-being.


Diet and nutrition affect virtually all aspects of our health. Eating a healthy, balanced diet has been shown to reduce the risk of a myriad of health conditions, from heart disease and stroke, to diabetes and obesity. Diet can also affect our mental health, with several studies suggesting that certain diets may reduce the risk of developing depression and anxiety.

Food can either fuel or foil a workout, and research shows that combining a healthy diet with adequate exercise offers more benefits than improving diet alone. The right combination of fluids, carbohydrates and protein, eaten at the right time, can improve athletic performance and decrease fatigue. Poor dietary choices, like eating right before a high-intensity cardio workout, can lead to increased nausea and make exercise more challenging.

What we eat also impacts sleep quality and duration. Caffeine is notorious for making it more difficult to fall asleep and eating too close to bedtime can lead to sleep disruptions. Most health experts recommend avoiding caffeine prior to sleeping. Having too much calories or fat in your diet may make it harder to get enough sleep, as do diets lacking key nutrients, like calcium, magnesium, and vitamins A, C, D, and E.


Exercise is a cornerstone of health and benefits nearly every system in the body. Many of the benefits are seen immediately, like reduced anxiety, lowered blood pressure, and better sleep. Consistent exercise offers even more long term benefits, including better weight management, stronger bones, and a reduced risk of more than 35 diseases.

High intensity exercise decreases appetite, often for at least 30 to 60 minutes after finishing a workout. Physical activity can also help you feel more satisfied and full after a meal. Unfortunately, sedentary activities appear to have the opposite effect. Research has shown that people who spend more time watching television consume more calories and are more likely to be overweight.

A substantial amount of research has shown that getting regular exercise can improve sleep. Both aerobic exercise (like cardio and running), as well as resistance exercise (like weightlifting) can improve sleep quality. Any amount of movement may improve sleep, although younger people usually require more exercise than older people to see the same benefits. Usually, exercise in the afternoon or early evening helps with sleep. Exercise done just before sleep will increase stress hormones, which can worsen sleep problems.

Working out can also reduce the risk of sleep problems, like insomnia, obstructive sleep apnea (OSA) and restless leg syndrome (RLS). Multiple studies have shown that exercise can reduce pre-sleep anxiety and improve sleep quality in people with insomnia. One study found that a 12-week regimen of aerobic and resistance training led to a 25% reduction in the severity of OSA, while also improving sleep quality and reducing daytime fatigue. A similar study in people diagnosed with RLS found that a 12-week exercise regimen reduced the severity of this condition by 39%


Sleep offers the body and brain time to restore and recover, affecting nearly every tissue in the body. According to the National Sleep Foundation most adults need at least 7 to 9 hours of sleep, yet almost one third of Americans are getting less than 6 hours per night. Sleep deprivation increases the risk of health conditions like diabetes, heart disease, and stroke. Prolonged sleep deprivation can also affect concentration and other cognitive functions.

Without enough sleep, people tend to overeat and choose unhealthy foods. Sleep deprivation affects the body’s release of ghrelin and leptin, two neurotransmitters that tell our brain when to consume calories. People who are sleep deprived are more drawn towards high-calorie foods. Chronic sleep loss has been linked to having a larger waist circumference, and an increased risk of obesity.

Sleep allows muscle tissue time to recover between workouts. Sufficient sleep is also important in having the energy to exercise. Not getting enough sleep can lead to being less physically active during the day and reduced muscle strength during workouts. Sleep deprivation can also affect the safety of exercise, with increased sports injuries reported in those who are underslept.


Which Is Most Important: Diet, Exercise, or Sleep?

While trying to manage a busy, hectic life, it’s understandable to want to prioritize activities that provide the most benefit. Unfortunately, diet, exercise, and sleep are so deeply intertwined, it’s not possible to say that one is more important than the others.

For people who are tight on time or aren’t able to tackle all three, it can be helpful to talk to a doctor for personalized recommendations. A doctor, with knowledge about someone’s unique health history, can help to prioritize lifestyle changes. Doctors can also refer their patients to specialists, like nutritionists, dieticians, physical therapists, and sleep specialists for more tailored advice.

Improving Sleep Through Diet and Exercise

While most people know that diet and exercise are two important ways to improve their health, sleep is often overlooked. Sleep hygiene, which involves recommendations that promote quality sleep, are a good place to start if you’re looking to improve your sleep. Here are some tips for improving your sleep hygiene through diet and exercise:

  • Don’t eat too late: Be sure to give your body time to digest after eating large meals. Try having dinner earlier in the evening.
  • Avoid caffeine: Beware of stimulants like coffee, energy drinks, and soda. If you do consume these, try to limit them to early in the day. If you find yourself drinking a lot of caffeine during the day, ask yourself if you’re making up for excessive daytime sleepiness.
  • Move your body: Schedule regular exercise to improve your sleep. While any movement during the daytime is good, it’s even better to get regular, moderate exercise a few days a week. Try to avoid working out too close to bedtime, giving your body a few hours after working out to wind down before bed.
  • Get some light: Try exercising outdoors, as exposure to natural light during the day can help keep your body in sync with its natural sleep rhythms.
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About Our Editorial Team

Rob Newsom

Staff Writer

Rob writes about the intersection of sleep and mental health and previously worked at the National Cancer Institute.

Dr. Anis Rehman



Dr. Rehman, M.D., is a board-certified physician in Internal Medicine as well as Endocrinology, Diabetes, and Metabolism.


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