Metabolism is usually viewed as something to speed up or slow down. The familiar advice is to eat less, move more, fast longer, cut carbs. Of course, the weight may shift at first (and often much faster if you are nowhere near perimenopause) but what rarely gets discussed is what this really does deep inside your cells, and to your long-term health.

While diet and lifestyle definitely matter in maintaining a healthy weight, this article is not about restrictive foods lists or rigid meal plans. Instead, I want to present a very different view on metabolism and share with you an essential foundation to understand and implement before making any changes to how you eat or considering weight-loss medication.

A few words on insulin first…

Insulin is often described as a fat storage hormone. In reality, it is acts more like a metabolic conductor, orchestrating how your body regenerates, makes hormones, and produces energy.

When insulin is chronically disrupted –  either via constant grazing or overeating, or suppressed with aggressive dieting and fasting, the body can lose some of its metabolic flexibility.

The following can happen:

• Cells lose flexibility and their membranes weaken
• Myelin production slows – the protective fatty sheaths in the brain and spinal cord – initially experienced as brain fog, but later in life presenting as balance problems, vision changes, and memory loss
• Mitochondria become less efficient, leading to fatigue
• Hormone synthesis falters and menstrual cycles become disrupted
• Metabolic flexibility flattens, showing up as intense cravings and stubborn weight gain

Your body starts sacrificing long-term cellular health for short-term results.

You may look leaner, but inside, the system that keeps you vibrant, energetic, and hormonally balanced is quietly breaking down with potential consequences to your health.

This is foundational – metabolism is not controlled by food alone.

Your body listens to light before it listens to food.

True metabolic health is not about suppression. It is about alignment with natural light.

Every cell in your body, and every microbe in your gut, is finely tuned to nature’s circadian rhythm – a biological clock set primarily by sunlight. Seasonal changes in daylight directly influence insulin sensitivity, thyroid activity, leptin signalling (the hormone that regulates your metabolism), and appetite hormones – all key players in metabolic health.

Do you notice how your energy lifts when spring begins and the days grow longer? It is light – and it is one of the most powerful metabolic signals your body receives.

That sluggish feeling in winter was not a failure of willpower. It was your body doing exactly what it was designed to do – conserving energy, directing nutrients towards repair and restoration, responding intelligently to shortened days and reduced light.

Why spring improves your metabolism and how you feel in your body

It is the light. As UV light increases and days lengthen, your body gradually shifts into a more active metabolic state. Insulin sensitivity improves and carbohydrate tolerance rises. Your body begins to move outward – more energy, more appetite for lighter foods, a natural pull towards activity and expansion.

Spring is the season of detoxification following the repair work of winter. As the body begins to mobilise and move toxins out, the foods that nature provides in spring are precisely what support this process.

Also, for detoxification to happen safely, you need at minimum one complete bowel movement per day. If you are constipated, toxins recirculate rather than leave – which is why gut health is always part of the picture.

Why eating locally matters

Local, seasonal foods carry the photonic and biochemical information that guides your metabolism at each time of year. A mango in March in Hampshire is sending the confusing signal to your cells – it is a summer food from a tropical climate, and your metabolism knows it.

This is genuinely challenging as our shops offer strawberries and tropical fruit year-round. The aim is not strict rules, but small shifts.

Visiting a farmers’ market, choosing local, paying attention to what is in season, can make a real difference to your metabolic signalling over time.

Practical steps for supporting your metabolism this spring

Get outside within the first hour of waking. Even on grey cloudy mornings, morning light is the most powerful signal for insulin sensitivity and circadian rhythm regulation. Even five to ten minutes per day makes a difference to your metabolic health.

Reduce artificial light after sunset. In the evening, use amber or red lighting, limit screens after dark, and consider wearing blue-blocking glasses. Your metabolism, not just your sleep, benefits from this.

Transition your plate from heavier winter meals towards lighter meals and soups, spring vegetables, including more leafy greens, bitter herbs, and lighter proteins.

Support your liver – nettles, dandelion, bitter greens, adequate water, and daily movement are your best tools right now.

Eat seasonally (and organically) when possible – farmers’ markets, farm shops, and seasonal produce sections in supermarkets. What is growing near you right now is exactly what your metabolism needs.

Your metabolism is intelligent

True metabolic health is not just about calories, or restriction. It is about how your body interacts with the light available to you, movement, and with the foods that are growing near you right now.

When you eat and live in rhythm with the spring, you are speaking the language your cells understand. Weight releases more easily, energy returns, and your hormonal system has the raw materials it needs to function at its best. 

 

Here are some scientific references supporting the role of light exposure and circadian rhythm in metabolic health:

Lempesis, I.G., & Scheer, F.A.J.L. (2026). Illuminating the influence of natural daylight on human metabolism. Cell Metabolism, 38(1), 7–8. https://doi.org/10.1016/j.cmet.2025.11.017

Ishihara, A., Courville, A.B., & Chen, K.Y. (2023). The complex effects of light on metabolism in humans. Nutrients, 15(6), 1391. https://doi.org/10.3390/nu15061391

Whalley, K. (2023). Light dampens metabolism. Nature Reviews Neuroscience, 24, 131. https://doi.org/10.1038/s41583-023-00680-2