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A white radiator beside a wooden window, the central heating that makes modern homes comfortable

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The Hidden Downside of Indoor Comfort

by Solmate on Aug 10 2026
Central heating, sealed windows and climate control made the modern home brilliant. They also quietly made it biologically incomplete. What we gained, what we lost, and how to keep the gains.
An office interior lit from within, seen through glass windows at night

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Modern Life Wasn't Designed for Human Biology

by Solmate on Aug 10 2026
Modern life was optimised for convenience, not biology. The mismatch shows up quietly in mood, sleep, vitamin D status and energy. A worldview piece on how we got here and what to do about it.
A person working late at a dimly lit office desk under artificial light

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Why Your Whole Life Happens Under Artificial Light

by Solmate on Aug 10 2026
Modern adults experience almost no natural light from waking until sleeping. What the swap to artificial light is doing to mood, sleep and vitamin D status — and how to push back without unplugging.
A foggy street lined with bare winter trees, evoking the winter fog feeling

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The 'Winter Fog' Feeling, Explained

by Solmate on Aug 10 2026
Brain fog, sluggishness, flat motivation, the feeling that something is off but you cannot name it. What 'winter fog' actually is, how SAD and low vitamin D show up in the body, and when to see your GP.
A potted plant beside an indoor window, reaching for the little daylight available

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Are We Spending Too Much Time Indoors?

by Solmate on Aug 10 2026
We spend roughly 90% of our lives indoors. The statistics, what that's doing to mood and vitamin D status, and why the conversation about SAD and winter symptoms is bigger than it looks.
A dim bedroom with a window on a grey winter morning, illustrating winter tiredness

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Why Winter Tiredness Feels Different

by Solmate on Aug 10 2026
Winter tiredness isn't the same as normal tired. It's heavier, less responsive to sleep, more diffuse. Why that is biologically — and how to tell ordinary fatigue from something worth addressing.
Oranges, peas and limes on a wooden table, showing nutrients working together in whole foods

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Why Nutrients Rarely Work Alone

by Solmate on Aug 10 2026
Nutrients in the body don't work in isolation. They activate each other, redirect each other, and depend on each other. Why the single-ingredient supplement model misses how the body actually uses them.
Warm sunlight streaming through window blinds, the natural source of vitamin D

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What Vitamin D Actually Does in the Body

by Solmate on Aug 10 2026
Vitamin D is not just about bones. A clear walk through what it does in the body — calcium absorption, immunity, muscle function, mood, brain — and why its effects depend on the nutrients alongside it.
Two different types of vitamin capsules side by side, illustrating vitamin D2 versus D3

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Vitamin D2 vs D3: What's the Difference?

by Solmate on Aug 10 2026
Vitamin D2 vs D3 — sources, chemistry, effectiveness, and what the research says about which raises blood levels best. A clear answer to the most-Googled question about vitamin D supplements.
Plain white supplement tablets, representing a basic single-ingredient vitamin D supplement

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Why Most Vitamin D Supplements Feel Incomplete

by Solmate on Aug 10 2026
Most vitamin D supplements stop at D3. The body doesn't. Why K2, magnesium, B vitamins and zinc matter — and what to actually look for in a daily formula.
A view of a UK city street through a rain-covered window in winter

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Why the NHS Recommends Vitamin D in Winter

by Solmate on Aug 10 2026
The NHS recommends a daily 10 microgram vitamin D supplement for everyone over the age of one from October to March. Here is exactly why, what the SACN evidence says, and who needs to pay particular attention.
Vitamins to Take with Mounjaro: A UK Guide for GLP-1 Users

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Vitamins to Take with Mounjaro: A UK Guide for GLP-1 Users

by Solmate on May 20 2026
1 in 7 GLP-1 users will be vitamin D deficient within a year. Here is what to actually supplement, why, and at what dose — based on the published research, not marketing.
Mounjaro and Vitamin D Deficiency: What the Research Shows

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Mounjaro and Vitamin D Deficiency: What the Research Shows

by Solmate on May 20 2026
Mounjaro users have a 49% higher risk of vitamin D deficiency. Here is the dose, the test to ask for, and what to do this week.
GLP-1 Nutrient Deficiency: The Hidden Cost of Weight Loss Drugs in the UK

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GLP-1 Nutrient Deficiency: The Hidden Cost of Weight Loss Drugs in the UK

by Solmate on May 20 2026
GLP-1 drugs work brilliantly. They also create the largest preventable nutrient deficiency the NHS has ever seen. Here is the playbook.
The Indoor Generation

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The Indoor Generation

by Solmate on May 19 2026
Modern humans are quietly becoming the most indoor generation in the species' history. What that's doing to the body, and the small daily corrections that put it right.
Since When Did Fluorescent Lighting Count as Daylight?

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Since When Did Fluorescent Lighting Count as Daylight?

by Solmate on May 19 2026
Office lighting cannot do what sunlight does. Why we made the swap, what it actually costs the body, and the simple correction that closes the gap.
Why Vitamin D Matters More in the UK

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Why Vitamin D Matters More in the UK

by Solmate on May 19 2026
The UK has a vitamin D problem rooted in latitude, climate and lifestyle. What the NHS recommends, what the evidence says, and what to do about it.
Why Modern Life Quietly Keeps Us Indoors

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Why Modern Life Quietly Keeps Us Indoors

by Solmate on May 18 2026
Modern life has quietly become indoor life. Daylight exposure has collapsed in a generation — and your body is feeling it. What is actually going on, and what to do about it before next winter.