Edge Coffee Journal

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Research-backed reads on coffee, health, and what really ends up in your cup.

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Cheerful steaming coffee mug next to a small salt shaker and a pinch of salt crystals on a warm wooden kitchen table.

Does Salt in Coffee Reduce Bitterness? What Stu...

Does salt make coffee less bitter? Taste studies found sodium can suppress bitterness. Here's why coffee tastes bitter and how tiny a pinch to try.

Does Salt in Coffee Reduce Bitterness? What Stu...

Does salt make coffee less bitter? Taste studies found sodium can suppress bitterness. Here's why coffee tastes bitter and how tiny a pinch to try.

Illustration of a smiling, steaming coffee mug between a rising sun and an alarm clock, with soft swirling lines in the sky and coffee beans on a wooden table.

Why Does Coffee Make You Poop? What the Studies...

Why does coffee make you poop? Here is what gut studies found about how fast it works, why it is not just the caffeine, and whether decaf does it too.

Why Does Coffee Make You Poop? What the Studies...

Why does coffee make you poop? Here is what gut studies found about how fast it works, why it is not just the caffeine, and whether decaf does it too.

Illustration of a steaming mug of coffee beside a large clock and a sunrise window, with coffee beans scattered on a wooden table.

The Best Time to Drink Coffee: Is the 90-Minute...

Should you wait 90 minutes after waking to drink coffee? Here is what cortisol and caffeine studies actually found, and the timing the evidence supports.

The Best Time to Drink Coffee: Is the 90-Minute...

Should you wait 90 minutes after waking to drink coffee? Here is what cortisol and caffeine studies actually found, and the timing the evidence supports.

Illustration of a glass kettle and a carafe of clear water beside a steaming mug of coffee and a pour-over dripper on a wooden counter, with water droplets and coffee beans.

The Best Water for Coffee: Hardness, Alkalinity...

What is the best water for coffee? A 2026 taste study found alkalinity, not hardness, shapes flavor most. Here is what to look for in tap, filtered and bottled water.

The Best Water for Coffee: Hardness, Alkalinity...

What is the best water for coffee? A 2026 taste study found alkalinity, not hardness, shapes flavor most. Here is what to look for in tap, filtered and bottled water.

Illustration of a steaming mug of coffee beside a wall clock and a window shifting from bright afternoon sun to a starry night sky, with coffee beans on a wooden counter.

How Long Does Caffeine Last? Half-Life, Sleep a...

How long does caffeine last? It peaks within an hour and has an average half-life of about 4 hours. Here is what sleep studies found about timing your last cup...

How Long Does Caffeine Last? Half-Life, Sleep a...

How long does caffeine last? It peaks within an hour and has an average half-life of about 4 hours. Here is what sleep studies found about timing your last cup...

Illustration of a level balance scale holding a steaming mug of coffee on one pan and a glass of water on the other, with coffee beans and water droplets on a wooden counter.

Does Coffee Dehydrate You? What the Studies Act...

Does coffee dehydrate you? Controlled studies found everyday coffee hydrated habitual drinkers about as well as water. Here is what the research measured, why the myth stuck, and the fine...

Does Coffee Dehydrate You? What the Studies Act...

Does coffee dehydrate you? Controlled studies found everyday coffee hydrated habitual drinkers about as well as water. Here is what the research measured, why the myth stuck, and the fine...