6 Things That Are Secretly Sabotaging Your Skin Glow

You've tried the serums. The SPF. The double cleanse. And yet your skin still looks... flat. Dull. Like it's missing something.

Here's the thing most beauty content won't tell you: no topical product can compensate for what's happening on the inside. Skin glow isn't just about what you put on your face. It's a reflection of your internal environment, and several surprisingly common habits are quietly working against you every single day.

The real culprit is rarely your skincare routine. More often, it's your lifestyle.

Below are six things that are secretly stealing your glow, backed by science, and what you can actually do about them.

1. You're Eating Too Much Sugar (and Your Collagen Is Paying for It)

Sugar is one of the most underestimated skin saboteurs. When you consume excess sugar, it triggers a process called glycation, where sugar molecules bind to proteins like collagen and elastin in the skin, making them stiff and brittle. The result? A dull, uneven complexion, fine lines that appear earlier than they should, and a loss of that natural bounce.

Research published in PMC confirms that a high-sugar diet leads to the accumulation of advanced glycation end products (AGEs) in the skin, which directly accelerate visible ageing. One study found that strictly controlling blood sugar for just four months reduced the production of glycosylated collagen by 25%.

The sneaky part? It's not just the obvious offenders like sweets and fizzy drinks. High-glycaemic carbohydrates, such as white bread, white rice, and processed cereals, spike blood sugar in exactly the same way.

What to do: Swap high-GI staples for whole grain alternatives. Your collagen will thank you.

2. Your Gut Health Is Out of Balance

The gut-skin axis is one of the most exciting areas of dermatological research right now, and it's one that most people in the beauty space are still sleeping on. Your gut microbiome directly influences skin health through its effects on the immune system, inflammation levels, and hormone regulation.

When the gut microbiome is disrupted (a state called dysbiosis), it can trigger systemic inflammation that shows up on your face as dullness, redness, breakouts, and uneven texture. A 2024 review in PMC found that dysbiosis in the gut can trigger immune responses that lead to visible skin inflammation, linking poor gut health directly to conditions ranging from acne to psoriasis.

Think about it this way: your skin is often the first place your body signals that something is off internally.

Key insight: Probiotic-rich foods and a fibre-heavy diet don't just benefit your digestion. They actively support clearer, more radiant skin by keeping inflammation in check.

What to do: Add fermented foods (kefir, yoghurt, kimchi) and prebiotic fibre (oats, bananas, garlic) to your daily diet. Or look for a supplement that supports the gut-skin connection directly.

3. You're Not Getting Enough Healthy Fats

Low-fat diets had their moment, but your skin never agreed with them. Healthy fats, particularly omega-3 fatty acids, are essential for maintaining the skin's lipid barrier. This barrier is what keeps moisture locked in and environmental irritants locked out. Without enough of it, skin becomes dry, flaky, and dull, no matter how much moisturiser you apply on top.

According to Healthline, omega-3s help reduce skin inflammation and keep skin supple and hydrated from within. Meanwhile, research shows that high trans-fat diets actively promote inflammation and skin irritation, while diets lacking in healthy fats reduce gut bacteria diversity and increase systemic inflammation.

The irony is that many women cutting fat from their diet in the name of health are actually accelerating skin ageing.

Signs You Might Be Low in Healthy Fats

• Skin feels tight or dry even after moisturising

• Flaky patches that don't respond to topical products

• A generally dull or flat complexion

• Increased sensitivity or redness

What to do: Prioritise oily fish (salmon, mackerel, sardines), avocado, walnuts, and flaxseeds. If your diet is inconsistent, an omega-3 supplement is a reliable way to fill the gap.

4. Chronic Stress Is Ageing Your Skin Faster Than You Think

Stress is the lifestyle factor that almost everyone acknowledges but nobody actually addresses. When you're chronically stressed, your body produces elevated levels of cortisol, the stress hormone. Cortisol breaks down collagen, increases oil production, and triggers inflammation throughout the body, all of which translate directly into dull, congested, or prematurely aged skin.

The Cleveland Clinic notes that stress-related skin flare-ups are one of the most common dermatological complaints, with cortisol disrupting the skin barrier and making it more reactive to environmental triggers.

What makes this particularly insidious is the feedback loop. Skin that looks dull or broken out causes more stress, which causes more cortisol, which causes more skin issues.

"Stress doesn't just affect how you feel. It physically changes the structure of your skin at a cellular level."

What to do: Stress management sounds obvious, but the skin-specific angle matters here. Prioritise sleep (your skin repairs itself at night), reduce caffeine after midday, and consider nutrients that support the body's stress response, like B vitamins and magnesium, both of which are commonly depleted under chronic stress.

5. You're Chronically Dehydrated (Even If You Drink Water)

Drinking water is necessary, but it's not the whole picture. Many people who drink adequate amounts of water still have dehydrated skin, because hydration at the cellular level depends on more than fluid intake alone. Electrolytes, minerals, and certain vitamins all play a role in how well your body actually retains and utilises that water.

A narrative review in PubMed identified low water intake as one of the primary dietary habits harmful to skin health, but also noted that the quality of hydration, including adequate antioxidants and minerals, matters just as much as the quantity.

Alcohol and caffeine are the two

5. You're Chronically Dehydrated (Even If You Drink Water)

Drinking water is necessary, but it's not the whole picture. Many people who drink adequate amounts of water still have dehydrated skin, because hydration at the cellular level depends on more than fluid intake alone. Electrolytes, minerals, and certain vitamins all play a role in how well your body actually retains and utilises that water.

A narrative review in PubMed identified low water intake as one of the primary dietary habits harmful to skin health, but also noted that the quality of hydration, including adequate antioxidants and minerals, matters just as much as the quantity.

Alcohol and caffeine are the two

5. You're Chronically Dehydrated (Even If You Drink Water)

Drinking water is necessary, but it's not the whole picture. Many people who drink adequate amounts of water still have dehydrated skin, because hydration at the cellular level depends on more than fluid intake alone. Electrolytes, minerals, and certain vitamins all play a role in how well your body actually retains and utilises that water.

A narrative review in PubMed identified low water intake as one of the primary dietary habits harmful to skin health, but also noted that the quality of hydration, including adequate antioxidants and minerals, matters just as much as the quantity.

Alcohol and caffeine are the two biggest hidden culprits here. Both are diuretics, meaning they actively pull water out of your cells. If you're drinking coffee throughout the morning and a glass of wine in the evening, you're working against your own hydration efforts.

The Hydration Checklist

What to do: Match every coffee or alcoholic drink with a glass of water. And consider whether your diet is rich enough in minerals like zinc and selenium, which support the skin's ability to retain moisture and resist oxidative damage.

6. You Have Nutritional Gaps You Don't Know About

This is the big one. Most people assume that if they eat reasonably well, they're getting everything their skin needs. But the reality is that the modern UK diet is often deficient in the specific micronutrients that skin health depends on most.

The nutrients most commonly linked to dull, lacklustre skin include:

• Vitamin C - essential for collagen synthesis; the body cannot produce it on

6. You Have Nutritional Gaps You Don't Know About

This is the big one. Most people assume that if they eat reasonably well, they're getting everything their skin needs. But the reality is that the modern UK

5. You're Chronically Dehydrated (and Drinking the Wrong Things)

This one sounds basic

The Fix Starts From Within

If you've read this far and recognised yourself in more

5. You're Chronically Dehydrated (and Drinking the Wrong Things)

This one sounds basic, but most people are more dehydrated than they realise — and the effects on skin are immediate and visible. When your body is even mildly dehydrated, your skin loses plumpness, fine lines look more pronounced, and that natural lit-from-within glow disappears. Skin is about 64% water, and it's one of the last organs to receive hydration when your body is running low.

But here's the part that often gets missed: it's not just about how much water you drink. It's about what else you're drinking alongside it.

The Dehydration Culprits Nobody Mentions

• Caffeine acts as a mild diuretic, meaning your morning coffee is actively pulling fluid from your body. Two or three cups a day is fine for most people, but if you're not replacing what's lost, your skin pays the price.

• Alcohol is one of the most aggressive skin dehydrators. It suppresses the hormone that helps your kidneys retain water, leading to the puffy-yet-dull complexion most people recognise the morning after a few drinks.

• High-sodium diets cause your body to retain water in the wrong places, leading to puffiness and poor circulation to the skin.

According to the Cleveland Clinic, proper hydration helps skin maintain elasticity and reduces the appearance of dryness and dullness. And while drinking more water alone won't solve everything, it creates the foundation that everything else builds on.

What to do: Aim for around 2 litres of water daily. Add electrolyte-rich foods (coconut water, cucumber, leafy greens) to help your body actually absorb and use what you're drinking. And if you're regularly drinking alcohol or multiple coffees, add an extra glass of water for each one.

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says:

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says:

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says:

A 2025 study published in the Journal of Investigative Dermatology found that participants who increased their dietary vitamin C intake showed measurably thicker skin (a direct marker of collagen production) and faster renewal of the outer skin layer. Crucially, the researchers noted that vitamin C from food reaches every layer of the skin via the bloodstream — far more effectively than topical application. Yet studies consistently show that a large proportion of adults in the UK fall below the recommended daily intake.

The challenge is consistency. You might eat well some days and not others. Travel, busy weeks, stress — they all disrupt the dietary patterns that keep skin looking its best. That's why so many women find that targeted supplementation fills the gaps that diet alone can't always cover.

6. You're Missing Key Skin Nutrients in Your Diet

Even with a reasonably healthy diet, targeted skin nutrients are surprisingly easy to fall short on. Vitamin C, zinc, biotin, and hyaluronic acid are all essential for collagen synthesis, skin repair, and maintaining that dewy, hydrated look — and most of us simply don't get consistent enough amounts from food alone.

Here's what the research says:

Healthline reports that vitamin C is one of the most well-evidenced nutrients for skin health, directly stimulating collagen synthesis and protecting against UV-related oxidative damage. Yet studies consistently show that a large proportion of adults in the UK fall below the recommended daily intake.

The challenge is consistency. You might eat well some days and not others. Travel, busy weeks, stress — they all disrupt the dietary patterns that keep skin looking its best. That's why so many women find that targeted supplementation fills the gaps that diet alone can't always cover.

Key insight: Topical skincare can support the surface. But nutrients like vitamin C, zinc, and biotin work at the cellular level — where glow actually starts.

What to do: Audit your diet for the nutrients above. If you're consistently missing them, a targeted skin supplement is one of the most efficient ways to ensure you're hitting what your skin actually needs, every single day.

The Easiest Fix? Start From the Inside

If you've recognised yourself in any of the above, the good news is that skin glow is recoverable. The not-so-good news is that no serum or face mask is going to address the root causes. Reducing sugar, supporting your gut, eating more healthy fats, managing stress, staying hydrated, and hitting your key nutrients — these are the levers that actually move the needle.

But overhauling your diet all at once is a tall order. That's where a targeted supplement can do the heavy lifting.

Nurtured Club's Skin Serenity Gummies are formulated with exactly the nutrients covered above: vitamin C and plant collagen for collagen production, zinc to regulate oil and support healing, hyaluronic acid for deep hydration, and astaxanthin for antioxidant protection. Two strawberry-flavoured gummies a day, no complicated routine, no guesswork.

Shop Skin Serenity at Nurtured Club and give your skin the inside-out support it's been missing.