You know exercise builds muscles, strengthens bones, keeps your heart healthy and your mind sharp. But it also does something that you might not think much about: It helps keep your immune system β your internal defenses against infection β in tip-top shape.
If you take time for some physical exertion each day, it helps get your body ready to attack bacteria, viruses and toxins that can sneak in and make you sick.
But how much exercise is effective? Do too little or too much, and it wonβt have the best effect on yourΒ immune system.
Clinical immunologist Β Leonard Calabrese, DO, answers common questions about how exercise can impact your immunity and how to use your workouts to shut out a world of would-be invaders.
Q: How does breaking a sweat boost immunity?
A:Β If you exercise moderately on a regular basis, it tunes up the immune system in many ways. It enhances your broad-based defenses against viral infections, such as those causing upper respiratory infections.
Working out regularly also reduces the risk of many chronic diseases such as cardiovascular, respiratory illnesses and metabolic diseases, such as type 2 diabetes.
Q: How much exercise do you need?
A:Β Fortunately, you donβt have to push yourself to the limit to rev up your immune system. In fact, your immune system needs less of a workout than you get with your average cardio routine.
Focus on getting 20-30 minutes of moderate exercise, five days a week, and yourΒ immune systemΒ will thank you.
Q: What types of exercise are most helpful?
A:Β Moderate exercises, including biking or walking briskly in your neighborhood, are good ways to get your blood flowing. Swimming is also a good option for non-weight-bearing exercise for your joints.
Also try mind-body exercises such as Tai-Chi, Qi Gong and yoga, which are all options that help keep your joints flexible. These exercises also reduce chronic stress, which in itself is a powerful immune booster. These exercises can also help alleviate osteoarthritis andΒ fibromyalgiaΒ symptoms.
Q: Can too much exercise set your immune system back?
A:Β Yes, though, the level to which it can slow your system down is still up for debate.
ResearchΒ shows that exercising for more than 1.5 hours without refueling your body or giving it enough time to recover suppresses your immune responses for up to a few days. During that time, your cortisol levels rise, your white blood cell count drops and youβre more likely to develop a respiratory infection.
This problem usually affects elite athletes, such asΒ marathonΒ runners, most.
On the flip side, staying sedentary also increases your risk of infection, inflammation and chronic disease.
Q: Can exercise make an illness worse?
A:Β Yes, it can. This is a complex issue, but I like to tell my patients to do a βneck check.β If your symptoms are mostly of a mild cold without fever or lower respiratory symptoms, such as a productive cough, wheezing or shortness of breath, mild exercise can actually reduce congestion and may make you feel better.
If your symptoms are primarily in your lungs or you have a significant fever its better to rest until things settle down. Regardless, good hydration is important.
A creamy smoothie with crunchy toppings β in a bowl!
Ingredients
Smoothie base
1 1/2 cups plain yogurt
1 banana, frozen
1/2 cup orange juice
1 cup berries of your choice
1 tablespoon flaxseeds
1 scoop vanilla plant-based protein powder, optional
Toppings
1 tablespoon slivered almonds
1 teaspoon chia seeds
1 tablespoon pomegranate seeds
Directions
Blend all base ingredients together until smooth, adjusting for sweetness and thickness.
Serve immediately in a large bowl with toppings.
Ingredient health benefits
Yogurt: WithΒ probioticsΒ and prebiotics to go around,Β yogurtΒ is a great way to show yourΒ stomachΒ some love. Yogurt is also aΒ complete protein, which means it has all nine essential amino acids that your body needs to function properly (but canβt make on its own). And, most famously, it hasΒ calciumΒ to keep your bones happy and healthy.
Bananas: Most everyone knows that bananas are a great source ofΒ potassium, but thereβsΒ so much moreΒ to this zany-looking fruit than popular knowledge conveys. Bananas also haveΒ magnesiumΒ andΒ vitamin B6, which help regulate blood pressure and metabolism. And they haveΒ fiberΒ to keep your gut working properly.
Flaxseed: This little seed really is worth the hype.Β FlaxseedΒ is a source ofΒ omega-3 fatty acidsΒ (omega-3s, for short), which are vital for your body to function as it should. Flaxseed also hasΒ fiberΒ and antioxidants that fight damagingΒ free radicalsΒ andΒ chronic inflammation.
Chia seeds: Another tiny seed with plenty of perks, chia seeds improve your digestion and promote the growth ofΒ good bacteriaΒ thatΒ keep your gut healthy. Their quirky ability toΒ expand in fluidΒ can help you stay fuller for longer when theyβre in your stomach juices, which can be helpful if youβre trying to lose weight.
Pomegranate seeds: TheseΒ little gemsΒ are as good for you as they taste. The squishy packets around the seeds contain juice thatβs high inΒ antioxidants, which might support the health of your heart. Pomegranate juice may also have cancer-fighting abilities, but research is ongoing. Still, incorporating pomegranates into a hearty, nutritious diet wouldnβt hurt!
Nutrition information (per serving)
Makes 4 servings Serving = 3/4 cup
Calories: 160 Carbohydrate: 27 g Sugars: 17 g Fiber: 4 g Saturated fat: 0.5 g Cholesterol: 5 mg Protein: 9 g Sodium: 70 mg
We all want to protect our kids whether it be from falls, bumps and bruises β or avoidable infections and diseases. To help your child avoid illness, itβs important to encourage good habits and take steps to boost their immune system from an early age.
βMost of what makes a childβs immune system strong is common sense,β says pediatrician Adriane Lioudis, MD. If you keep these five tips in mind, youβll stack the deck in your childβs favor for a healthier life.
1. For newborns, considerΒ breastfeeding
While itβs a very personal decision (that isnβt always possible), if you are able to exclusively breastfeed your child for at least six months, it may have benefits. Some research shows that breastfeeding your child might possibly reduce allergies, Dr. Lioudis says.
2. Promote regular hand washing
Eighty percent of infections are spread by touch. Teach your little one to take the time to wash their hands after sneezing, coughing and going to the bathroom. Washing hands with warm water and soap for at least 20 seconds can remove bacteria and viruses and can reduce the chance of lung infections by up to 45%.
βGet the flu shot for your child yearly, as well,β Dr. Lioudis says. This is particularly important for children with asthma and other chronic health conditions.
Also, if your family will be traveling internationally, itβs important to seek advice from your childβs healthcare provider about any needed vaccinations.
4. Make sleep a priority
To maximize immunity, children must get enough sleep.
Babies between 0 and 3 months need 14 to 17 hours of sleep. Those between 4 and 12 months need 12 to 16 hours of sleep.
Children between the ages of 1 and 2 need between 11 and 14 hours.
Kids between the ages of 3 and 5 should get from10 to 13 hours.
Children ages 6 to 12 should get between 9 and 12 hours.
Teens between the ages of 13 to 18 need 8 to 10 hours.
Not getting enough sleep limits the bodyβs ability to produce proteins called cytokines that help fight infection and reduce inflammation.
5. Encourage a healthy diet
A healthy diet is also important for your childβs immune system.
Dr. Lioudis recommends encouraging your child to βeat the rainbowβ when it comes to fruits and vegetables. A good selection of whole grains should be part of their diet as well. Keep processed foods to a minimum. Proper food choices can help ensure that your child gets enough vitamins β such as vitamin A and E. These vitamins are needed to maintain good health and a strong immune system.
You canβtΒ avoid all illness, but some kidsΒ need extra protection
βEven if you follow these tips, your child might still get between seven and 11 colds each year,β says Dr. Lioudis. She adds that you can expect each one to last up to two weeks.
Also, keep in mind that some things billed as common βremediesβ arenβt effective in boosting immunity. For example, thereβs no definitive proof that large amounts of vitamin C or echinacea help prevent colds or shorten them, she says.
However, if your child has a compromised immune system, work closely with your pediatrician to find ways to improve his or her immunity. Each child needs a personalized approach because their individual immune system varies, Dr. Lioudis says.
βThereβs generally a different protocol with immunocompromised children. There are some vaccines we have to add in on top of what most children have, but itβs something that we must determine on a case-by-case basis.
Too much refined sugar can cause a cascade of medical problems; too much social media can also affect health β especially mental health, writes #HarvardHealth contributor Sharon Levy. Here’s how: https://bit.ly/3EI7ijy
Many older adults focus on exercise and diet to stay healthy. But one of the worst offenders to healthβpoor balanceβis often an afterthought. “I see a lot of older adults who are nonchalant about balance,” says Liz Moritz, a physical therapist at Harvard-affiliated Brigham and Women’s Hospital.
Unfortunately, imbalance is a common cause of falls, which send millions of people in the United States to emergency departments each year with broken hips and head injuries. But there are many things you can do to improve your balance. The strategies below are some of the most effective.
Physical therapy
Physical therapy for balance focuses on the ability of the joints and brain to communicate, the balance system in the ear (the vestibular system), and vision. “We coordinate all three with exercises such as standing on one foot, first with the eyes open, and then with the eyes closed. We also work on joint flexibility, walking, and lower-extremity exercises on one or two legs,” says Moritz. Other exercises that boost balance include chair stands (see “Move of the month”) and squats. Make sure you get training before attempting these exercises at home.
Muscle strengthening
“Core strength is very important for balance. If the abdominal muscles in your core are weak, they cannot support your limbs, especially when you’re walking. If the gluteal muscles in your buttocks and hips aren’t strong, they won’t be able to propel you forward,” says Moritz. Muscle strengthening can help. Moritz suggests starting with gentle core exercises like a pelvic tilt (lie on the floor with your knees bent up, then roll your pelvis up) and then moving to more intense exercises such as wall planks (stand six inches from a wall, keeping your body rigid, then lean forward with your forearms flat against the wall, and hold the position for 20 seconds). Leg lifts will strengthen the gluteal muscles, and adding resistance bands to leg lifts makes the exercise even more effective.
Tai chi and yoga
“Tai chi and yoga are exercises that make you pay attention to the control and quality of movement, rather than the quantity, which improves your balance,” says Moritz. In tai chi, you practice slow, flowing motions and shift your weight from one limb to another. Yoga incorporates a series of focused postures and breathing. Both exercises increase flexibility, range of motion, leg and core strength, and reflexes. The result: you become better at balancing in a number of different positions, which helps you avoid falling if you encounter uneven pavement or obstacles in your path.
Vision correction
“If you can’t see where you’re going, your fall risk goes up,” says Moritz. “A lot of people I treat for balance are here be-cause they tripped when they didn’t see something on the floor.” The fix may be as simple as a new eyeglasses prescription. Get a comprehensive, dilated eye exam every one or two years if you’re 65 or older, every one to three years if you’re age 55 to 64, and every two to four years if you’re 40 to 54. If you have an increased risk for other eye conditions, you may need an eye exam more often.
Assistive walking devices
A cane or a walker can complement your balance and give you more stability and confidence walking. But don’t buy a device on your own. “If it’s too high or too low, that can cause a fall. You need to get it measured, and you need training to learn how to use it,” says Moritz. Training takes just a few physical therapy sessions. Walkers are available with wheels intended for different terrain, lockable brakes, seats, baskets, and other features such as headlights. Canes are available with various handgrips and bases.
If you run regularly, whether itβs an easy jog around the block to stay fit or an intense training regimen to prepare for a marathon, you need proper nutrition.
Here are some tips to help keep runners well-nourished and ready to win.
Foods for Runners and Joggers
A good diet can boost your physical health and help you meet your fitness goals. Make sure your meals emphasize the following basic components:
Fruit and vegetables for vitamins, minerals and antioxidants
Lean protein such as fish, poultry, beans, lentils and tofu
Healthy fats such as olive oil, avocado and nuts
Healthy carbohydrates such as rice, whole grain breads/pastas and oatmeal
Individuals may have different optimal balances, but in general, people who include running or jogging as part of their fitness regimen should get 60% to 70% of their calories from carbohydrates, with lean protein and healthy fats each accounting for 15% to 20% of their remaining calories.
Donβt skimp on carbohydrates
Although low carbohydrate diets are popular go-toβs for people wanting to lose weight, theyβre not ideal for distance runners, who thrive on carbohydrates for endurance.
That is why very low carbohydrate diets, such as the ketogenic diet, plus running is not a good idea. Experts do not recommend keto to runners unless they have been told by their doctor that this a medically safe option for them and they are being monitored while in ketosis.
Distance runners need more carbs than people who arenβt training. Undereating carbohydrates can be hard on your body and affect your recovery after your run.
Hereβs why: Running uses both glucose in the blood and your stores of glycogen. Glucose is the form of sugar that circulates in the bloodstream, and glycogen is the sugar stored in your liver and muscles that acts as the primary fuel for endurance exercise.
Eating plenty of carbs helps ensure that these energy stores are ready to support your training. When those stores get too low, runners are more likely to run out of energy and βburn outβ or βhit a wallβ while training.
Running Diet β Vitamins and Minerals
Running changes your body and your nutritional needs. Often when people start a running regimen, they are trying to lose weight or get in shape quickly, and they donβt realize they need to adjust their diet.
Especially in women runners, dietitians report seeing a tendency to overdo the running while not eating enough, and this can have an effect on health if they do not adequately replenish lost vitamins and minerals in their diet.
For women in particular, calcium and vitamin D are essential for bone health to avoid loss of bone mineral density and the risk of stress fractures.
For more vitamin D, include these foods in your meals:
Vitamin D-fortified dairy and almond, soy or rice based beverages
Eggs
Cereal fortified with vitamin D
Tuna
Salmon
For more calcium, try:
Yogurt and cheese
Tofu
Edamame
Almonds
Canned fish with bones (such as sardines)
Iron deficiency can affect women and even have an impact on their running performance. Menstruation puts people at higher risk of iron deficiency, and if iron isnβt replenished in the diet, decreases in hemoglobin can occur and bring on anemia. Hemoglobin is what carries oxygen throughout the body, including the muscles, so if there is a deficit, the muscles may feel the effect of insufficient oxygen during exercise.
Iron-rich foods include:
Poultry and other meat
Legumes, such as peas and beans
Dark, leafy green vegetables such as kale
Dried fruits and raisins
Iron-fortified breads and cereals
Dietitians recommend eating eating iron rich foods in combination with foods high in vitamin C, such as citrus, bell peppers or berries, since vitamin C helps increase the bodyβs absorption of iron.
What to Eat Before Running β and When
The best time to eat a full meal is about two to three hours before you hit the road, track or trail. Have a good source of carbs paired with protein, making sure the meal focuses on a healthy carb source.
If itβs been more than three to four hours since youβve eaten, a carbohydrate-rich snack a half-hour before running can ensure you have adequate glucose available before you head out. Directly before a run, itβs best to stick with easy-to-digest carbohydrates to avoid gastrointestinal [GI] distress such as cramping or diarrhea.
Try these:
Bananas
Applesauce
Crackers, pretzels or cereal
White bread
Potatoes
Glucose Boosters for Long Distance Runners
If you are training for a marathon or distance event and are going to be out for over an hour, you will want to bring some fuel with you. Energy drinks, gel tubes and other sources of quick blood-glucose boosters are available, but you can also use something as simple as fruit snacks.
Try practicing with these items as you train so you can pick the formulas that are best for you, and you can work on accessing and ingesting them smoothly without breaking stride.
What foods should runners avoid?
Before a run or the night before a big race, Eidel recommends going easy on:
Spicy foods or foods overly high in fat, which can cause GI upset
Foods that are very high in fiber, which can cause gas and cramping
Caffeine β Although it is tempting to grab a caffeine boost right before a run, runners should remember that for some people, caffeine can stimulate the GI tract, which can result in diarrhea or the need for an emergency bathroom break
Does carb-loading work?
It might. Carb loading is the practice of eating a lot of carbohydrates β particularly those that are easily absorbed, such as white bread, pasta and rice β for 24 to 48 hours before a big race or distance run, to shore up your bodyβs stores of glycogen and lessen the risk of burnout before finishing the event.
Some studies show carb loading is beneficial for people preparing for a race, but itβs important to make sure during that time youβre also allowing your body to rest and giving it time to store what you are ingesting. The number of carbohydrate grams will be differ from person to person, but in general, evidence shows carb loading can be beneficial prior to a distance event.
In contrast, casual runners likely do not need to carb load. Ensuring that their day-to-day diets include extra carbohydrates can be sufficient.
What to Eat After a Run
Itβs common for people not to feel hungry after a run, but a snack or light meal of complex carbohydrates and protein within the first hour after running can help replenish glycogen stores and to support recovery and rebuild stressed muscles. For example:
Peanut butter and banana
Egg on toast
Sandwich with deli meat
Pasta with meat or plant-based protein
Veggie burger on a bun
Protein shake or smoothie
Running to Lose Weight
If youβre interested in running as part of a weight loss plan, getting adequate nutrition is a must. Even casual running or jogging burns calories and can be hard on the body. Runners can become undernourished at first because they donβt understand how much energy theyβre burning when they run and what they need to properly recover.
Eating enough is also essential to building muscles, which can aid in fat burning β a plus for people working on achieving or maintaining a healthy weight.
For optimal weight loss, your plan should not rely on running alone but also include strength training and proper nutrition.
Listen to your body
If you run regularly, you should pay attention to the effects of what you eat and when, especially on running performance. Learning what works best for you can take some time and a little trial and error, but it is worth it, since running, jogging and other regular aerobic exercise offers so many health advantages.
Always feel free to consult a dietitian or doctor, and listen to your body if youβre not keeping up with your training goals.
A modest uptick in the amount of fruit and vegetables you eat can help ward off type 2 diabetes, according to a study published online July 8, 2020, by The BMJ. From a much larger study involving some 340,000 people from eight European countries, scientists selected 9,754 participants who were newly diagnosed with diabetes over a decade. Researchers compared the fruit and vegetable intakes of these people to those of about 13,000 participants who remained diabetes-free during the study period. Researchers also measured blood levels of seven key plant-derived nutrients, including vitamin C and brightly colored antioxidant pigments called carotenoids. People with the highest intakes of fruit and vegetables and the highest blood levels of the plant-derived nutrients were 25% to 50% less likely to get diabetes during the study period, compared with those who ate the least of these food groups or had the lowest nutrient levels. Even better, it didn’t take a whole lot of extra green, red, yellow, and orange on the plate to make a dent in diabetes risk. The equivalent of only two-thirds of a medium apple or just over one-third of a cup of mixed fruit each day offered protection.
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