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Why adding, not restricting, should be your New Year’s Resolution

6 mins

Written by Rachel Redman - Registered Dietitian

Reviewed by Eloise Garbutt, Specialist Dietitian in Gastroenterology and Gut Health

Every January, diet culture dusts off the same old advice. Cut carbs. Ditch dairy. Quit sugar. Stop snacking.

Most diet-related New Year’s resolutions are built on restriction, based on the belief that better health comes from removing more and more foods from our plates. But nutritional science is consistently showing something different: long-term health isn’t built on exclusion — it’s built on diversity, adequacy, and consistency.

So this year, instead of asking, “What should I stop eating?”, try asking a far more helpful question:

What can I add?

Because when it comes to gut health, adding plant-based diversity to your diet is far more beneficial — and far more sustainable — than following the next restrictive fad diet.

Why diversity matters for your gut and microbiome

Your gut is home to trillions of microorganisms, collectively known as the gut microbiome. Together, they act in a complex ecosystem- almost like an additional organ- influencing your digestion, immune system, metabolic health and brain function (1).

These microbes feed on dietary fibre and plant chemicals that your body cannot digest on its own. When these fibres reaches the gut, microbes ferment it to produce a range of biologically active substances, including short-chain fatty acids (SCFAs) (2), neurotransmitters (3) and certain vitamins (4). These substances play a key role in maintaining the gut lining, regulating immune responses, and supporting metabolic and brain health.

Crucially, different beneficial microbial species prefer different types of fibre. Diets that include a wide variety of plant foods help support greater microbial diversity, creating a gut ecosystem that is more resilient, adaptable, and functionally robust. In fact, research suggests that people who consume 30 or more different plant-based foods per week tend to have higher microbial diversity — a key marker of gut health (5).

Why restrictive diets harm you and your microbes

Restrictive diets that eliminate specific foods or entire food groups reduce the range of fibres, polyphenols and micronutrients reaching the gut. From an ecosystem perspective, this is like removing key resources from the environment. Research consistently shows that lower dietary diversity and fibre intake are linked with reduced microbial diversity (6), alongside poorer immune, cardiovascular and metabolic health outcomes.

Restriction also has a behavioural cost. Diets based on avoidance are associated with increased feelings of deprivation and food preoccupation, which can make them harder to sustain over time (7). A truly supportive way of eating nourishes the gut ecosystem and also supports a healthier, more flexible relationship with food in the long term.

5 benefits of embracing plant-based diversity

1. A more resilient immune system

Around 70% of the body’s immune cells are located in the gut, making gut health central to immune balance. A diverse microbiome, supported by fibres and polyphenols from plant foods, helps regulate immune responses and strengthen resilience to infection (8).

2. Sluggish bowels left in 2025

Including a wide variety of plant-based foods and aiming for around 30g of dietary fibre per day helps support your gut microbiome and also promotes regular bowel movements. Fibre adds bulk to stool and helps retain water, making stools softer, easier to pass, and more comfortable. Fermentable fibres also feed beneficial gut microbes, which further support healthy gut motility and overall digestive function.

3. Support for your brain

The gut and brain are constantly in communication. A healthy gut microbiome produces substances (like SCFAs) that influence mood, cognition, and stress responses (9). Dietary diversity plays a meaningful role in this gut-brain connection.

4. Feeling satisfied for longer

Plant foods are naturally rich in fibre and water, which slow digestion and help stabilise blood sugar levels, reducing energy crashes later in the day. Fibre intake also triggers satiety hormones involved in appetite regulation. Together, these effects help you feel fuller for longer and make that 3pm energy dip far less likely.

5. Lower risk of chronic disease

While not always top of mind when setting New Year resolutions, greater plant diversity is associated with a significantly lower risk of chronic conditions such as type 2 diabetes, cardiovascular disease and coronary heart disease (10).

How to start adding more diversity to your day

To support your 2026 diversity resolution, here are some evidence-backed tips that focus on adding plant variety, without strict rules or restrictions.

Add one new plant to your shopping list each week

Explore seasonal fruits and vegetables and pick a new, less familiar food each week. Search for a recipe where that plant is the hero, not the sidekick, of the dish.

Stock up on tinned beans and lentils

Affordable, versatile, and shelf-stable, they provide both fibre and plant protein. They bulk out meals, feed your beneficial gut microbes, and support digestive health.

Aim for at least one meat-free night each week

Try vegetable and chickpea or bean curries, stews, pasta, or traybakes. Using pulses and vegetables as the base increases fibre, polyphenols, and micronutrients — all key for a healthy gut ecosystem.

Create a diversity jar

Keep a mix of nuts and seeds on the kitchen side, ready to top porridge, salads, soups, or stir-fries. This simple addition boosts fibre, plant-based protein, and micronutrients — a small but powerful way to nourish your microbiome.

Make breakfast more diverse

Breakfast is often repetitive. Add seeds, berries, grated apple, or different nuts to porridge, yoghurt, or toast to support microbial diversity and keep you fuller for longer.

Use frozen fruits and vegetables

Frozen absolutely counts! Keep mixed packs of fruits, vegetables, and herbs in the freezer for effortless variety, minimal waste, and a convenient way to top up your fibre and micronutrient intake daily.

Rotate your grains

Instead of always choosing rice or pasta, try one new grain each week: barley, farro, bulgur, quinoa, freekeh, or buckwheat. Different grains feed different gut microbes and often provide a higher fibre alternative while also being delicious.

Upgrade snacks with plants

Rather than cutting out snacks, plan ahead and make them plant-focused: fruit with nut butter, oven-roasted chickpeas, veg sticks with hummus, plain popcorn with mixed nuts. Pairing fibre with protein or healthy fat also helps you feel fuller for longer and while supporting your gut ecosystem.

A different kind of food resolution

This year doesn’t need more rules, bans or food fear. It can be about nourishment, curiosity and variety instead. When you focus on adding plant-based diversity, healthier habits tend to follow naturally. Your gut feels supported, your meals become more enjoyable, and your resolution becomes something you can stick to beyond the second week of January. So instead of asking what to cut out in 2026, try asking:

“What plant can I add today?”