Jeffrey Salazar
A healthy diet is essential for human health and growth. Eating a balanced diet of plant and animal foods is key to staying healthy. Nutritional requirements change as we move through different life stages, and a varied diet that includes plenty of nutrient-dense foods is recommended for everyone, regardless of age. Experts break nutrients down into two categories: macronutrients and micronutrients. Macronutrients are the primary building blocks of a diet and provide the body with energy. Micronutrients include vitamins and minerals, which support the immune system, cells, and metabolism.
| Characteristics | Values |
|---|---|
| Macronutrients | Carbohydrates, protein, and fat |
| Micronutrients | Vitamins and minerals |
| Calories | Should be balanced with energy expenditure |
| Fruits and vegetables | At least 5 portions a day |
| Starchy foods | Potatoes, bread, rice, pasta |
| Dairy | Milk, yoghurt, cheese |
| Fibre | Legumes, beans, lentils, whole grains |
| Fluids | At least 6-8 glasses of water a day |
| Fats | Should not exceed 30% of total energy intake |
| Saturated fats | Less than 10% of total energy intake |
| Trans fats | Less than 1% of total energy intake |
| Sugar | Avoid foods high in sugar |
| Salt | Avoid foods high in salt |
| Folate | Important for women of childbearing age and during pregnancy |
| Iodine | Important during pregnancy |
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What You'll Learn
Macronutrients: protein, carbohydrates, and fats
Macronutrients are the primary building blocks of a healthy diet and provide the body with energy. They are needed in large amounts and include protein, carbohydrates, and fats.
Protein is essential for growth, health, and body maintenance. It supports every cell in the body, from bone to skin, hair, and muscle. Hormones, antibodies, and other important substances are made of protein. Meat, fish, beans, pulses, eggs, and dairy are good sources of protein.
Carbohydrates are another important macronutrient. Higher-fibre, starchy foods like potatoes, bread, rice, and pasta are recommended as the base for meals. Carbohydrates provide the body with energy, and a healthy diet should include a variety of these foods.
Fats are also necessary in the diet, but it is important to consume the right types of fats. On average, people in the UK consume too much saturated fat, which can increase cholesterol levels and the risk of heart disease. Unsaturated fats, found in oils and spreads, are healthier and can help lower cholesterol. All types of fat are high in energy and should be consumed in moderation.
In addition to these three macronutrients, a healthy diet should also include fruits and vegetables, which are good sources of vitamins, minerals, and fibre.
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Micronutrients: vitamins and minerals
Micronutrients are essential for maintaining overall health and well-being. They are needed in small amounts but play a crucial role in various bodily processes and functions. Vitamins and minerals are the most important micronutrients.
Vitamins are nutrients that our bodies need in small amounts. They are essential for proper growth, development, and overall health. There are many different types of vitamins, each with its own specific role in the body. For example, vitamin A is important for maintaining healthy vision and immune function, while vitamin C is crucial for collagen formation, iron absorption, and immune function. Other important vitamins include the B vitamins, such as vitamin B1 (thiamin), which helps convert food into energy and supports nerve function, and vitamin B2 (riboflavin), which aids in energy production and cell growth.
Minerals are also essential micronutrients that play a key role in maintaining health. They are typically found in inorganic forms and are involved in the structure and function of enzymes, cellular energy production, and maintaining the acid-base balance in the body. For instance, calcium is a mineral that is important for bone health, nerve impulse transmission, and muscle contraction. Phosphorus is another crucial mineral, playing a role in energy metabolism and as a structural component of RNA and DNA.
Micronutrient deficiencies or excesses can have adverse health consequences. Common micronutrient deficiencies worldwide include vitamin A, folate, iodine, iron, and zinc deficiencies, which can contribute to perinatal complications, poor growth, cognitive impairment, and increased morbidity and mortality. Maintaining a balanced and varied diet rich in nutrient-dense foods is essential to avoid these deficiencies.
To ensure adequate micronutrient intake, it is recommended to consume a variety of fruits and vegetables, whole grains, lean meats, dairy products, nuts, and seeds. These foods provide a range of vitamins and minerals that support overall health and well-being.
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Fruit and vegetables: at least 5 portions a day
Eating at least five portions of fruits and vegetables every day is essential for a healthy and balanced diet. This recommendation was introduced by the UK government in 1994 as part of the 'five-a-day' campaign, which aimed to encourage people to consume a variety of fruits and vegetables to improve their health.
Fruits and vegetables are excellent sources of vitamins, minerals and fibre, which are crucial for maintaining a healthy body. They help reduce the risk of heart disease, stroke, certain types of cancer, diabetes and obesity. It is important to note that the amount of fruit and vegetables one needs may vary depending on individual characteristics such as age, gender, lifestyle and physical activity levels. For instance, children should aim for at least five portions but the amount they need may differ based on their age, body size and physical activity.
A portion for adults is typically defined as 80g of fresh, frozen, canned or dried fruit or vegetables. For dried fruit, a smaller amount of 30g is considered one portion. It is worth noting that beans and pulses are also a good source of fibre and protein, but they only count as one portion, regardless of the quantity consumed. Similarly, fruit and vegetable juices, smoothies and purées, even when unsweetened, are limited to a maximum of one portion per day due to their high sugar content, which can contribute to tooth decay.
To ensure you get your five-a-day, you can include a variety of fresh, frozen, canned, dried or juiced fruits and vegetables. Canned or tinned options should be stored in natural juice or water, without added sugar or salt. Additionally, fruit and vegetables can be incorporated into meals such as soups, stews or pasta dishes.
In conclusion, aiming for at least five portions of fruits and vegetables daily is a healthy practice. They provide essential nutrients, help reduce the risk of various health conditions and can be consumed in a variety of ways to suit individual preferences and needs.
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Dairy or alternatives
Dairy products, such as milk, cheese, and yoghurt, are great sources of protein and calcium. They can form part of a healthy, balanced diet. Calcium is vital for healthy teeth and bones, and protein helps support every cell, from bone to skin, hair, and muscle.
However, some people need to avoid dairy products because their bodies cannot digest lactose (lactose intolerance) or due to an allergy to cow's milk protein. Lactose intolerance can cause symptoms such as bloating and diarrhoea. Those who are unable or choose not to consume dairy products may be at risk of not getting enough calcium in their diet.
There are a number of lactose-free dairy products available that are suitable for people with lactose intolerance. These contain the same vitamins and minerals as standard dairy products, but they also have an added enzyme called lactase, which helps digest lactose.
For those who are unable or choose not to consume any dairy products, there are plenty of dairy alternatives. These include unsweetened calcium-fortified dairy alternatives, made from plants like soya, coconuts, or oats, which count as part of the same food group. Other alternatives include almond milk, coconut milk, and calcium-fortified soy, rice, and other cereal drinks.
It is important to note that replacing dairy products with plant-based alternatives may make it difficult to meet dietary mineral requirements, such as calcium and vitamin D. A carefully planned diet and supplementation can help ensure that all nutrient needs are met.
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Healthy fats: unsaturated oils and spreads
A healthy diet includes a balance of macronutrients and micronutrients. Macronutrients, which include protein, carbohydrates, and fats, are the primary building blocks of a healthy diet and provide the body with energy. Micronutrients, on the other hand, include vitamins and minerals, which support the immune system, cells, and metabolism.
Fats are an essential part of a healthy diet, but it is important to consume the right types of fats in the appropriate amounts. On average, people in the UK consume too much saturated fat, which can increase cholesterol levels and the risk of heart disease. Therefore, it is recommended that most of the fat in your diet should come from unsaturated oils and spreads.
Unsaturated fats are healthier and can help lower cholesterol levels. They are typically found in plant foods and oily fish, and they are usually liquid at room temperature. There are two types of unsaturated fats: monounsaturated and polyunsaturated fats, both of which have different functions in the body. Monounsaturated fats are found in oils such as vegetable, rapeseed, olive, peanut, and sunflower oil. Polyunsaturated fats include omega-3, omega-6, and omega-9 fats. Omega-3 fats are particularly beneficial and are found in oily fish, flaxseed, linseed, hemp, and fortified foods.
To incorporate more unsaturated oils and spreads into your diet, consider making simple swaps. For example, choose unsaturated oils like olive or rapeseed oil for cooking, and opt for spreads made with these oils instead of solid fats like butter or margarine. Remember that all types of fat are high in energy, so they should be consumed in small amounts as part of a balanced diet.
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Frequently asked questions
Macronutrients and Micronutrients. Macronutrients are the primary building blocks of your diet and provide your body with energy. They are needed in large amounts and include protein, carbohydrates, and fats. Micronutrients include vitamins and minerals and are needed in smaller amounts.
Micronutrients include vitamins and minerals such as vitamin D, vitamin B12, folate, iron, and iodine.
Micronutrients can be found in a variety of foods. For example, vitamin D can be found in fatty fish, fortified dairy, soy milk, and fortified cereals. Folate can be found in green leafy vegetables, fruits, and legumes.
A healthy diet includes a variety of nutrient-dense foods such as fruits, vegetables, whole grains, legumes, dairy, and lean meats. It is recommended to eat at least 5 portions of fruits and vegetables every day and to limit the intake of saturated fats, sugar, and salt.
