top of page

The Immune System Explained

The immune system is a host defence system made up of many biological structures and processes within your organism, that protects against disease. To function properly, the immune system detects viruses and bacteria in the body and distinguishes them from the body’s own healthy tissues. If your immune system is compromised, the first response the body has is to repel the virus or bacteria, through bodily functions such as coughing, sneezing, or sweating. If you have a cut, for example, the body’s response is to cause inflammation as a first response. Inflammation can show up as redness, swelling, feelings of heat or pain in an area of the body, which are caused by increased blood flow to the affected tissue.

The immune system is affected by many factors, including sleep and rest, stress levels, nutrition and diet, to name a few. Looking after the body and protecting it from picking up a virus is essential, however it isn’t always possible to live in a bubble, therefore boosting the immune system is key to protecting ourselves, should illness arise.

There are many ways in which to boost the immune system, and keep it as strong and healthy as possible. First, let’s analyze the biggest culprits for negative effects on the immune system:


Resting, napping, sleeping, are probably the best ways to help boost the immune system. Resting gives your body a break, and allows it to focus on healing. This is the primary reason why someone who has had an accident is put on strict bedrest, or why a person with a severe injury is sometimes even put on a forced coma. Sleeping causes your blood pressure to drop, and your heart-beat lowered. It releases hormones that slow breathing down, relaxes the muscles throughout the body, and reduces inflammation to assist with healing.

According to the National Sleep Foundation in the United States, deep sleep is very important for acquiring the necessary energy for healing the body. NREM (non-rapid eye movement) sleep occurs first in a few stages, and it grows in progression to be the deepest, and most restorative sleep. This is when your blood pressure drops, breathing becomes slower, muscles relax as blood supply to muscles increases, tissue growth and repair occurs, and energy is restored. It’s also when growth hormones and repair are released, essentially when babies do their biggest ‘growth spurts’.

REM sleep (rapid eye movement), first occurs about 90 minutes after falling asleep, and after NREM, and recurs about every 90 minutes, getting longer later in the night. REM provides energy to the brain and body, and when the body becomes immobile and relaxed as muscles are turned off. It’s also when the brain is active and dreams occur, the eyes dart back and forth, and when the body supports daytime performance.

Proper sleep can also affect body weight, as sleep helps balance the appetite by helping us to regulate hormone levels; when we are sleep deprived, we may feel the need to eat more. The Foundation also recommends making up bad night-time sleep with a 20-minute nap, or two naps of no more than 30 minutes each.


For most of us, stress is a natural part of life that can last for a few minutes, like when you wake up late for an appointment, to years, like when you’re looking after an ill loved one. Although stress can be a great motivator to getting things done, and it can provide cortisol in short bursts to boost immune system, it can also take a toll on your health by decreasing the body’s lymphocytes, our helpful white blood cells that help fight off infection. In basic terms, the lower the lymphocyte levels in the body, the more at risk we are for viruses and disease.

According to the National Institute of Health, stress is responsible for as much as 90% of all illnesses and disease, which happens when stress triggers a chemical reaction in the body that decreases white blood cells and NK cells (those which can even kill off nasty cancer cells).


According to the US National Institute of Health, malnutrition is the most common cause of immune deficiencies worldwide, while over-nutrition and obesity also reduce immunity. In the elderly, one of the most recognized consequences of aging is a decline in immune function, and it’s believed this is largely due to a slowing down of cellular reproduction, lack of regular exercise, as well as a deficiency in nutrient intake. According to studies by Harvard Medical School, there is an evident connection between micronutrient malnutrition and sustained health. Micronutrients are one of the major groups of nutrients your body needs, and includes vitamins and minerals, necessary for energy production, immune function, blood clotting, bone health, fluid balance, and more. Studies further indicate that older people tend to eat less and often have less variety in their diets, requiring more supplementation.

Scientists have long recognized that people who live in poverty and are malnourished, are more vulnerable to infectious diseases. Harvard Medical School studies further indicate that deficiencies in zinc, selenium, iron, copper, folic acid, and vitamins A, B6, C, and E, can have altering effects on the immune system and its response.


Regular exercise is one of the most important keys in boosting the immune system – it helps maintain healthy blood pressure, improves cardiovascular health, helps control body weight, which all help ward off a variety of diseases. Exercise promotes good circulation, which allows the various cells and substances of the immune system to move through the body freely and do their job efficiently.

It’s important to note that studies have indicated that strenuous exercise has also been shown to temporarily depress the immune system, and exercising while feeling ill has been shown to make the symptoms and severity of the illness, even worse.

Jeffrey A. Woods, a professor of kinesiology and community health at the University of Illinois, says that in general, moderate exercise, such as a leisurely jog or walk, can prop up the immune response and lessen the duration and severity of a mild infection. He further recommends that “if you don’t feel well, especially if you have fever or body aches, daily exercise should be stopped until you have recovered.” He adds that it’s okay to exercise if you have a simple head cold or congestion, but it’s best to avoid heavy, prolonged exercise while feeling ill.”


There are many lifestyle and dietary changes we can do in order to support our immune system from the inside out. The body is an incredible machine, able to fight off infection, but we need to do our part in order to help it do its job.

Everything you put into your body – from food, drink, to stress, fresh air, and sleep deprivation, make up the ingredients that your body will use to create new cells, muscles, bone, tissue, and so on. Especially when there exists a lowered immune system, or by natural effects of aging, the body is resilient and can heal from many illnesses – current ones and ones yet to be discovered.

Here are the most important compilation of specialists’ recommendations, to help boost your immune system and protect it from illness:

Eliminate sugar intake altogether.

No more ice cream, cookies, muffins, sugary drinks (including juice) and cereals. Honey and maple syrup may be consumed in small amounts to flavour teas, etc. Sugar puts your white blood cells into a ‘temporary coma’ for as much as 3 hours, with as little as 1 teaspoon (4.5 grams) of sugar. Instead, eat real foods, as fresh as possible (or frozen as second best); you shouldn’t need anything with a nutritional label on the side, as this means it’s a processed food.

Avoid dairy foods.

As you work to strengthen your immune system, skip the milk and cheeses, ice cream, whey, sour cream, and heavy creams, as these foods can increase your body’s production of phlegm and mucous, which are a breeding ground for germs to live optimally in your gut. You may consume a small amount of butter, ghee, and plain yogourt (no sugar or sweeteners added). Instead, if you need a dairy-alternative to cook your meals with, try using unsweetened organic almond or hemp milk as better options.

Boost your veg intake

Vegetables are loaded with micronutrients your body needs to function at its best. Ensure each meal has at least 50% vegetables (fresh, or lightly steamed), and if possible, drink your vegetables as well. Making a daily batch of freshly blended vegetables, such as carrots, cucumber, kale, is a powerful way to boost your immune system. (note: a little fresh juice in a blender goes a long way! Just a few ounces will do your body wonders).

Reduce vices as much as possible

This includes coffee, black teas high on caffeine, and alcoholic beverages. You can enjoy a glass of wine after a special dinner on a weekend, but if you are truly interested in boosting your immune system, avoid alcohol as much as possible. The same goes for coffee and black teas, which are not only diuretics (which elevate urinary excretion of important minerals such as calcium, magnesium and potassium; they ‘dry your body up’), but their caffeine content increases stress hormones, lowers insulin sensitivity, and can interfere with normal detoxification in the liver… and since most people will drink them first thing in the morning on an empty stomach (as they “break” the “fast”), their long-term negative effects on the body are even more pronounced.

Avoid gluten-containing foods

This includes wheat-containing breads and pastas, cereals, baked goods, and pizza doughs, which are also all considered processed foods. Other grains that contain gluten include barley, rye, and its varieties such as spelt, kamut, farro, and products like bulgar and semolina. Gluten is a protein in these grains, and is difficult for the body to digest it properly, slowing the digestive system down and damaging the lining of the gut and small intestine. You may enjoy the occasional slice of toast with your eggs in the morning, but avoiding these foods is important as you adjust to feeling sufficiently satisfied from your meals by eating more fresh vegetables and proteins from meat, chicken and fish.

Skip the condiments

It has become common to indulge in these processed products, which include ketchup, hot sauces, mustard, and pouch-purchased gravies, rather than allowing the body to enjoy the true flavour and benefit of fresh foods. If your foods are lacking zip, try cooking with fresh herbs, spices, or the zest or juice from lemons and limes. Condiments are loaded with sugars and salt, which should be avoided in order to boost the immune system.

Ditch the microwave

Microwave ovens cook food using waves of energy that are similar to radio waves, but shorter. According to the World Health Organization, microwave energy can be absorbed by the body and produce heat in exposed tissues. In addition, and according to the UCLA Fielding School of Public Health, when a microwave is used to heat up food, these micro-waves can pass through glass, paper, plastic and similar materials, and are absorbed by foods. The rapid vibration that creates energy and heat in a microwave, causes many of the food’s micronutrient to be depleted – especially vitamin C, which is key for supporting the immune system. Instead, plan your meals ahead of time and consume as soon as they’re finished cooking, or re-heat slowly in a pot or oven.

Drink your water!

Although everyone knows the long list of benefits of drinking high amounts of water on a daily basis, not many follow this important advice. It’s simple: water hydrates the body, and by doing so, flushes toxins out of it. When you drink water, any bacteria ingested is immediately transferred to the stomach, where gastric juices will destroy it. Frequent urination is one of the few ways a body can detoxify naturally – aside from perspiring, defecating, and even crying. So drink up and keep those natural fluids flowing through and out of the body! We recommend keeping a jug of drinking water in the bathroom, this way you can fill up every time you have emptied out the bladder.

Take your supplements

Although there is little dispute that a person’s dietary habits have an effect on their overall health, it’s rare to find a medical physician who will support this fact as they oversee a person’s wellbeing. This is mostly due to the lack of hours in nutrition education provided at medical schools in North America. On average, a doctor will study just 25 hours of nutrition during their first four years of med school; because of this, we recommend everyone visit a naturopath and/or a holistic nutritionist, who have extensively studied the benefits of good nutrition and its positive effects on health.

In order to maintain and further boost the immune system, key supplements are recommended – especially as we age, stress, sleep little, overdo, and eat on the run. A naturopath and/or holistic nutritionist can best prescribe a good quality protocol of supplements and regiments to suit each person individually. It’s not recommended for anyone to visit a regular store and buy supplements ‘just because they heard it’s good for the body’, as many of these can either result in wasted money, low quality products, or counter-active health results. Just because it’s thought to be natural, doesn’t mean it’s going to be good for your specific needs.

The most commonly recommended supplements to boost the immune system include, a high quality Probiotic (to balance intestinal gut health), Vitamins C, D, B6 and B12, Zinc, Omega oils, and a very good quality multivitamin.


As they say when a baby if first born, “it takes a village”, and this is especially true when it comes to health. Just as you would find a professional to prepare your taxes or fix your car, we highly recommend finding more than just a family physician to support your health matters. As the saying goes, “Health is like money: We never have a true idea of its value until we lose it.”

Right now you have a chance to live a healthier life; take it.

- - - -

Silver and Gold Magazine focuses on the specific lifestyle, needs, and interests of the Boomers Plus demographic in Canada. Check out our website for more great articles, healthy and inexpensive recipes, tips and tricks that you can use!

#immuneSystem #boostImmune #SilverandGold #BoomersMagazine #protectYourBody #covid19 #bestAdvice #healthy #howtoliveahealthylife #agingGracefully #SuzanneSotoDavies

bottom of page