The Proof with Simon Hill
The Proof with Simon Hill

Lowering Blood Sugar Without Weight Loss | Dr Nicola Guess

August 17, 2026

AI Summary

5 min read

When dietitian and researcher Dr Nicola Guess started seeing patients with type 2 diabetes who desperately wanted remission but could not—or should not—lose the 10 kilograms typically required, she began asking a different question. What if you could improve blood glucose without weight loss at all? That question has driven a decade of research into what she calls "calorie-independent dietary approaches," and the results are striking: a carefully constructed high-protein, lower-carbohydrate diet can lower post-meal glucose by as much as 4 millimoles per liter (about 75 mg/dL) in people with type 2 diabetes—more than some medications—without a single pound of weight loss.

Why Protein Works When Glucose Sensing Fails

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What you'll learn

  • 1 Lowering Blood Sugar Without Weight Loss | Dr Nicola Guess
  • 2 The Proof with Simon Hill
  • 3 (00:04) **Why Calorie-Independent Approaches Matter** - Dr Guess explains her patient-centered motivation for studying dietary strategies that improve type 2 diabetes without requiring weight loss
  • 4 (02:42) **The Paradigm Shift in Diabetes Care** - How remission became a realistic goal and why the definition matters
  • 5 (04:59) **Why Glucose-Centric Definitions Fall Short** - Type 2 diabetes may be better understood as a disorder of fat metabolism
  • 6 (07:41) **When Glucose Is Actually Harmful** - The crucial distinction between diabetic and normal glucose levels
  • 7 (08:56) **Defining Metabolic Health** - What it means for organs to function optimally

+ Full timestamped outline available in the app

Show Notes

Can you meaningfully improve type 2 diabetes without losing weight? Dr Nicola Guess, registered dietitian and Senior Research Fellow at the University of Oxford, says the evidence is clear: a higher-protein, lower-carbohydrate diet can lower post-meal glucose by more than medication, no weight loss required.

We also tackle the noisier end of the blood sugar conversation: glucose spikes, fruit fear, insulin-first theories of obesity, and the panic about GLP-1s and muscle loss.

What We Cover:

  • Why glucose only causes direct harm at diabetic levels
  • How protein wakes up "sleepy" beta cells
  • What overfeeding trials reveal about insulin and obesity
  • Fruit, fibre, and fat quality: what matters and what doesn't
  • Menopause, PCOS, and shift work
  • The truth about GLP-1s and muscle loss

If you want a clear-eyed guide to metabolic health without the hype, this episode delivers.

To connect with Dr Nicola Guess, visit nicolaguess.com or find her on Instagram and YouTube.

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This episode is brought to you by:

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