Packing a Healthy Lunch Box: 5 Non-Negotiables from a Student Dietitian

Hi, I’m Bella! I’m a final-year student dietitian studying at UCL in London, with a passion for food, nutrition and making healthy eating feel simple, enjoyable and realistic. Alongside my degree, I run an Instagram page where I share student life, meal prep, easy and balanced recipes, and some of the nutrition knowledge along the way. I’m a big foodie and love exploring how food can support our health and wellbeing in a way that is practical and enjoyable.I’m half Norwegian and half Jamaican and have grown up in London, Singapore and Germany, so I’ve always had a love for food, travel and exploring different cuisines.

Why packing your own lunch is worth it

Lunchtime should be something you look forward to, not an afterthought you grab on the way out the door.

Packing your own lunch lets you build a meal you'll actually be excited to eat, and it saves money you might otherwise spend buying lunch out. But when life gets busy, lunch prep is often the first thing to slip.

As I head back into my own university schedule this September, it's front of mind for me too. So I've narrowed it down to five non-negotiables for a balanced lunchbox that works on busy days.

⁠1. Start with protein

I always build my lunch around a source of protein. Protein helps maintain and repair tissues, supports muscle health and carries out a range of essential functions in the body.

Good options include:

• Animal sources: chicken, fish, eggs, yoghurt and cheese
• Plant-based sources: tofu, tempeh, beans, lentils, nuts and seeds

How much do you need? For most healthy adults, the recommended intake in the U.K. is around 0.75g of protein per kg of body weight per day. Someone weighing 65kg, for example, would need around 49g a day. But there are various life stages and situations when eating above this level can be beneficial, for example if you're an older adult, working out regularly or on a weight loss journey (read more on this here).

Protein content varies a lot between foods, so getting familiar with food labels is a useful way to see what each food contributes.

Bella's tip: Make your protein around ¼ of your meal, or roughly the size of your palm.

2. Make it fibre-rich

Next, I make sure there's a good source of fibre.

Fibre is a type of carbohydrate found in plant foods like wholegrains, fruit, vegetables, beans, lentils, nuts and seeds. Unlike other carbohydrates, our bodies can't break it down. Instead, it supports digestion by keeping things moving through the gut and feeding our gut bacteria. It also helps you stay fuller for longer, which is perfect for a long day.

Adults should aim for around 30g of fibre a day, but average intakes in the U.K. are closer to 20g.

Easy fibre-boosting swaps:

• Wholemeal bread instead of white
• Brown rice instead of white
• Wholewheat pasta instead of regular
• Oats or wholegrain crackers
• Beans, chickpeas or lentils added to salads, pasta or grain bowls
• A sprinkle of nuts or seeds on top

Low FODMAP? Read more on low fodmap fibre rich choices here.

Bella's tip: Beans, chickpeas and lentils are brilliant for packed lunches. They add fibre, protein and texture without making everything soggy.

3. Add plenty of vegetables

We're encouraged to eat at least 5 portions of fruit and vegetables a day, and lunch is an easy place to fit a few in.

I aim for at least three different vegetables in my lunchbox, such as roasted peppers, cucumber, tomatoes, spinach, sweetcorn, carrots, broccoli, red cabbage or avocado.

Variety matters too. Different fruit and veg provide different vitamins, minerals and beneficial plant compounds, so aim for a range of colours and types across your week. Add a piece of fruit on the side and you're even closer to your daily target.

If your lunchbox looks like a rainbow, you're probably onto something!

Bella's tip: Fresh herbs contribute to your plant variety too. They are one of my favourite ways to add extra flavour, colour and freshness to a packed lunch.

4. Don't forget the fats

Fat often gets a bad reputation, but it's an essential part of a balanced diet. Dietary fats provide energy, supply essential fatty acids and help your body absorb fat-soluble vitamins.

I like to include a source of unsaturated fat, such as:

• Avocado
• Nuts and seeds
• Nut butters
• Extra virgin olive oil
• Oily fish, like salmon or mackerel

Bella's tip: Drizzle a little extra virgin olive oil over a salad or grain bowl, or add a handful of mixed seeds for crunch and flavour.

5. Pack a snack

My final non-negotiable is a snack.

If you tend to get hungry between meals (like me!), having something ready means you're not relying on whatever happens to be nearby when hunger hits.

Easy snack ideas:

• A piece of fruit and a handful of nuts
• Yoghurt and berries
• Hummus and veg sticks
• Rice cakes with nut butter
• Oatcakes with cheese
• Apple or pear with nut butter

Snacks don't need to be perfect. The aim is simply something you enjoy that keeps you going until your next meal.

Following a low FODMAP diet? click here for low FODMAP snack ideas.

Bella's tip: Apples and pears are in season in September. They're portable, affordable and provide fibre plus a range of vitamins and minerals. Slice one up and pair it with nut butter and a sprinkle of cinnamon.

The formula at a glance

Keep it simple

You don't need a completely different lunch every day. One of my favourite shortcuts is to batch cook a few ingredients and mix and match them through the week.

A healthy packed lunch doesn't have to be complicated. Use leftovers, make the most of what you already have, and choose foods you genuinely enjoy. Keep these five things in mind and building a balanced lunchbox will soon become second nature.