Vitamin A is the name given to a group of fat-soluble antioxidant compounds.  Two different types of vitamin A are found in the diet; “preformed vitamin A” (also referred to as retinol or retinal) is found in animal products and “pro-vitamin A” is found in plant based foods - the most common type being beta-carotene.  It was the first fat soluble vitamin to be recognised and is sometimes referred to as the “anti-infective” vitamin due to its enhancement of the body’s immunity against infections by increasing the lymphatic responses against disease forming antigens.  It keeps the mucous membranes moist that line the mouth, respiratory passage and urinary tract and enhances the activity of white blood cells. 

Known as retinol because it produces the pigments in the retina in the eye, it enables your eyes to adjust to light changes, keeps the eyes moist and improves night vision.  It can also significantly reduce the risk of cataracts and macular degeneration.  Vitamin A helps to keep your body free from free radicals and toxins which might cause damage to your skin, helping to keep it soft and supple by ensuring moisture retention.  Vitamin A deficiency can impair iron metabolism which can lead to anaemia despite adequate iron intake.  Playing an important role in cells’ ability to adapt to perform specific functions in larger organs, the richest sources of preformed vitamin A are found in liver, kidney, butter and whole milk, whereas good sources of pro-vitamin A are dark green leafy vegetables and yellow-orange vegetables such as sweet potatoes and carrots.

Vitamin A contributes to:

·         normal iron metabolism

·         the maintenance of normal mucous membranes

·         the maintenance of normal skin

·         the maintenance of normal vision

·         the normal function of the immune system

·         Vitamin A has a role in the process of cell specialisation

Vitamin C, a water soluble vitamin also known as ascorbic acid, is one of the safest and most effective vitamins whose benefits are many.  It is absolutely vital in collagen production – collagen is a simple protein and an essential part of our connective tissue – the very framework of our body.  All of the components that hold our bodies together such as skin, bones, blood vessels, teeth and gums, tendons and cartilage rely upon collagen.  Vitamin C is directly responsible for influencing collagen synthesis and helps to shield us from the symptoms of collagen deletion – most famously scurvy! 

A powerful antioxidant, vitamin C can protect cells from the damaging effects of free radicals which are harmful by-products of digestion or foreign substances in the atmosphere.  Inside the body it changes form to a negatively charged compound called ascorbate which helps to protect nerve cells and improves psychological function.  It has been known as the antioxidant’s antioxidant because it functions to protect vitamin E from oxidation too, another vitamin that interacts with free radicals to prevent cell damage.  Vitamin C strongly enhances the absorption of iron - when they are consumed and digested together, vitamin C combines with the iron to form a compound that is more easily absorbed.  Crucial to the overall health of the body in its efforts to fight off infections – both bacterial and viral – white blood cells contain 20 times the amount of vitamin C than other cells and require constant replenishment to keep the immune system working to its optimum capacity, especially during and after intense physical exercise.    Whilst highly concentrated in citrus fruits, other rich sources of vitamin C are acerola cherries, leafy green vegetables, red peppers and potatoes.

Vitamin C contributes to:

·         normal collagen formation for the normal function of blood vessels

·         normal collagen formation for the normal function of bones

·         normal collagen formation for the normal function of cartilage

·         normal collagen formation for the normal function of gums

·         normal collagen formation for the normal function of skin

·         normal collagen formation for the normal function of teeth

·         normal energy-yielding metabolism

·         normal functioning of the nervous system

·         normal psychological function

·         the normal function of the immune system

·         maintain the normal function of the immune system during and after intense physical exercise

·         the protection of cells from oxidative stress

·         the reduction of tiredness and fatigue

·         the regeneration of the reduced form of vitamin E

·         Vitamin C increases iron absorption

Forming 2% of total body weight in adults, calcium’s best known role is in bone and tooth health.  It forms a part of hydroxyapatite, the mineral complex that makes your bones and teeth hard and maintains bone density.  It is especially important that children consume an adequate amount of calcium to maximise their bone mass prior to adult years.  Also an important part of the blood clotting process, calcium works together with vitamin K and a protein called fibrinogen in the clotting cascade, without adequate levels of calcium and vitamin K the blood will take longer to clot.  Calcium helps your muscles contract in response to nerve stimulation, it activates a protein called calmodulin that your muscle cells need to provide the fuel they need to function.  Assisting in the transmission of neural impulses, the calcium in your body also aids other types of cell communication – it acts as a “second messenger” in your cells which means it responds to chemical signals from outside your cells and then triggers a response inside your cell. 

Calcium helps to activate several digestive enzymes and there is considerable evidence that calcium and vitamin D intake are influential in modulating energy metabolism in humans.  Like all minerals, calcium doesn’t work alone but in tandem with other nutrients such as magnesium and vitamin D, for this reason, obtaining our calcium from whole foods – foods whose nutrient profiles have been optimised by nature for superior absorption – is the best way to remain healthy!  Excellent natural calcium sources include; chia seeds, sesame seeds, seaweed (such as kelp and Kombu), dark leafy greens and dairy products (such as yoghurt, cheese and kefir).

Calcium contributes to:

·         normal blood clotting

·         normal energy-yielding metabolism

·         normal muscle function

·         normal neurotransmission

·         the normal function of digestive enzymes

·         Calcium has a role in the process of cell division and specialisation

·         Calcium is needed for the maintenance of normal bones

·         Calcium is needed for the maintenance of normal teeth

·         Calcium is needed for normal growth and development of bone in children

Iron is needed for a number of highly complex processes that continuously take place in the body on a molecular level and that are indispensable to human life.  Formation of haemoglobin is the chief function of this mineral – this is the primary protein found in red blood cells and represents about two thirds of the body’s iron.  Haemoglobin binds to the oxygen molecules that you breathe in from the air and releases them into your tissues.  The brain receives around 20% of the blood oxygen and a proper flow of blood to the brain can stimulate cognitive activity and help to create new neural pathways, it is especially important that children consume enough iron in their diet – iron deficiency in the first two years of a child’s life is associated with delayed cognitive and psychomotor development.  

Ribonucleic reductase is an iron dependant enzyme that is required for DNA synthesis (cell division), thus iron is required for a number of functions including healing and immune function - red blood cells are necessary for providing oxygen to damaged tissues, organs and cells.  Iron is also involved in food metabolism and is a cofactor and activator for some enzymes which play key roles in energy production and metabolism.  If iron stores are low symptoms can include tiredness, fatigue and dizziness.  Dietary iron has two forms, heme (animal based) and non-heme (plant based), important sources are; grass fed beef, oysters, spinach, lentils and beans.

Iron contributes to:

·         normal cognitive function

·         normal energy-yielding metabolism

·         normal formation of red blood cells and haemoglobin

·         normal oxygen transport in the body

·         normal function of the immune system

·         the reduction of tiredness and fatigue

·         normal cognitive development of children

·         Iron has a role in the process of cell division