Qiyu Yan's Notes

I'm Qiyu Yan — I run global business for pet food brands, I'm a certified advanced pet nutritionist, and I'm studying to be a China's Licenced Veterinary. This is where I translate the science and evolve my thinking in public. No jargon, no fluff.

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A few notes I'd hand you first.

Pet Nutrition

The Protein Debate for Senior Dogs: Rethinking Everything You Know About Protein Requirements

For decades, 'senior dog food' has meant low protein. But modern veterinary science says otherwise. Here's what AAHA 2023 and WSAVA 2024 actually recommend for senior dog protein — and why the old advice refuses to die.

October 7, 2026

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Study Notes

Why a Vegan Diet for Cats Is Biologically Impossible — And Why ‘Plant-Based Cat Food’ Is a Marketing Story, Not a Nutritional One

Can cats survive on a vegan diet? The biochemistry says no — and the story of why reveals more about human psychology than feline nutrition. A marketer-turned-nutrition-student breaks down the enzyme deficiencies that make obligate carnivory non-negotiable.

October 7, 2026

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Pet Nutrition

The Protein Debate for Senior Dogs: Rethinking Everything You Know About Protein Requirements

For decades, 'senior dog food' has meant low protein. But modern veterinary science says otherwise. Here's what AAHA 2023 and WSAVA 2024 actually recommend for senior dog protein — and why the old advice refuses to die.

October 7, 2026

Read →

Let's keep the conversation going

Questions, thoughts, or a different take? Write to me anytime — I read every message and I'm always happy to talk it through.

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