Why do we need these nutrients?

The reason we need a diet drawn from all of the groups is that they all deliver different, but vital, nutritional benefits to our bodies.

Fruit and vegetables are one of our main sources of vitamins and minerals, which the body needs to perform a variety of functions well. For instance, vitamin A helps to strengthen our immune system, B vitamins help us process energy from food, vitamin D helps us maintain healthy teeth and bones, and vitamin C helps to keep cells and tissues healthy. The steamed carrots and broccoli, pictured above, will maintain a higher proportion of vitamins than boiled or fried vegetables.

Fruit and vegetables (eaten with the skin on) also contain high amounts of fibre which help to maintain a healthy gut and digestive system.

Starchy foods, also known as carbohydrates, are where we get most of our energy from. Our bodies convert these foods into glucose which is used as energy either immediately or stored for later use.

Carbohydrates also contain fibre (especially wholegrain), and iron which we need to make red blood cells to carry oxygen around the body.

Meat fish, eggs and pulses provide us with significant amounts of protein which is essentially a building block of the body. Everything from our hair, muscles, nerves, skin and nails needs protein to build and repair itself. The grilled mackerel, pictured, is an excellent source.

Also high in protein are dairy products, and they are also great providers of calcium. The most common mineral in the body, calcium is needed for functions including helping blood to clot, and to build bones and teeth.

Fortunately, the fatty and sugary group, the foods that we find the most irresistible, also have a role to play, in moderation. Fat transports the fat-soluble vitamins A, D, E and K around the body. It also cushions and protects the internal organs.

Sugar is another food that gives us energy, whether it’s the naturally occurring fructose sugars in fruit or sucrose in table sugar. But, “other sources of carbohydrate, for example starchy foods, are a better choice for the nutrients they provide”, says Lydia Kelly.

Date: 2015-01-29; view: 1351