Fruits, vegetables, pulses and nuts

Introduction to Fruits, Vegetables, Pulses, and Nuts

Welcome to one of the most colourful and healthy parts of your Food and Nutrition course! In this chapter, we are looking at Fruits, Vegetables, Pulses, and Nuts. These foods are essential because they provide us with the vitamins, minerals, and fibre we need to keep our bodies running smoothly.

This chapter is part of the section "Composition and value of the main foods". This means we are focusing on what these foods are made of (composition) and why they are important for our health (value). Don't worry if the scientific names of vitamins or minerals seem hard at first—we will break them down into simple steps!

1. Fruits and Vegetables

Fruits and vegetables are often grouped together because they are both plant-based and are excellent sources of micronutrients (vitamins and minerals).

What are they made of? (Composition)

Most fruits and vegetables have a high water content, often over \(80\%\). This makes them refreshing but also means they can spoil quickly. Here are the main nutrients they provide:

• Vitamin C: Found in citrus fruits (lemons, oranges), berries, and green leafy vegetables. It is vital for a strong immune system and skin repair.
• Vitamin A (as Beta-carotene): Found in orange-coloured fruits and vegetables like carrots, mangoes, and apricots, as well as dark green leaves. It helps us see better in dim light.
• Minerals: Dark green vegetables are great sources of Iron (for healthy blood) and Calcium (for strong bones and teeth).
• NSP/Dietary Fibre: The cell walls of plants provide Non-Starch Polysaccharide (NSP). This is the "bulk" that keeps our digestive system moving.
• Carbohydrates: Fruits contain natural sugars (monosaccharides and disaccharides like fructose), while root vegetables like potatoes contain starch (polysaccharides).

The Value in our Diet

Why should we eat them? Fruits and vegetables add variety to our meals through different textures, flavours, and vibrant colours. Because they are generally low in fat and high in NSP/dietary fibre, they help prevent health issues like obesity and constipation.

Quick Review: Remember the "rainbow" rule—eating different colours of fruits and vegetables usually means you are getting a wide range of different vitamins!

2. Pulses (Legumes)

Pulses are the dried seeds of plants. Examples include lentils, chickpeas, kidney beans, and dried peas. (Note: Soya is also a pulse, but it is often studied separately because it is a unique source of High Biological Value protein).

What are they made of? (Composition)

• Low Biological Value (LBV) Protein: Pulses are an excellent "meat alternative," but they are LBV. This means they are missing one or more essential amino acids. Note: To make a complete protein, we often eat pulses with cereals (like beans on toast).
• Carbohydrates: They are high in starch, which provides slow-release energy.
• NSP/Dietary Fibre: Pulses are one of the best sources of fibre in the human diet.
• Minerals: They provide Iron and Phosphorous.

The Value in our Diet

Pulses are very economical (cheap) and have a long shelf life when dried. They are a "must-have" for vegetarians and vegans to ensure they get enough protein. They are also very filling because of their high fibre and starch content.

3. Nuts

Nuts are the seeds of certain trees and plants, usually enclosed in a hard shell. Examples include walnuts, almonds, cashews, and brazils.

What are they made of? (Composition)

• Fat: Unlike most fruits and vegetables, nuts are very high in fats/oils. This makes them high in energy (calories).
• LBV Protein: Like pulses, nuts provide protein but are generally Low Biological Value.
• Vitamin E: Many nuts are a good source of this antioxidant vitamin, which protects our cells.
• Minerals: They provide minerals like Potassium and Iron.

The Value in our Diet

Nuts add crunch and a rich flavour to dishes. Because they are energy-dense, they are great for people with active lifestyles. However, they should be eaten in moderation because of their high fat content.

Summary Table: Nutritional Comparison

This table helps you compare the four groups at a glance:

Practical Tips for your Exam (Paper 1 and Paper 2)

For Paper 1 (Theory): You might be asked to list the nutrients in a specific food. Remember: Pulses = LBV Protein + Starch + Fibre. Fruit/Veg = Vitamins + Minerals + Fibre.

For Paper 2 (Practical): Use fruits and vegetables to show off your knife skills (e.g., dicing, slicing). Adding a variety of vegetables to a dish also shows "variety in texture and colour," which is specifically mentioned in the marking criteria for the Practical Test!

Common Mistake to Avoid: Don't say fruits and vegetables have "no" protein. They have very small amounts, but they are not considered a source of protein. If a question asks for a plant-based protein source, always choose pulses, nuts, or soya.

Memory Aid: Think of NSP as a "broom" made of fruit and vegetable skins that sweeps out your digestive system! This helps you remember that NSP/dietary fibre is essential for preventing constipation.

Key Takeaways

• Fruits and Vegetables: High in water, Vitamin C, Vitamin A, and NSP. Essential for protection against disease.
• Pulses: Dried seeds, cheap source of LBV protein, high in starch and NSP.
• Nuts: High in fat/energy and Vitamin E, provide LBV protein.
• NSP/Dietary Fibre: Found in the cell walls of all these plant foods; vital for digestion.