
ZOE Science & Nutrition Tired and hungry? How the wrong breakfast will ruin your day | Prof. Benjamin Gardner & Professor Tim Spector
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Oct 23, 2025 Professor Tim Spector, an expert in gut health and personalized nutrition, joins Professor Benjamin Gardner, a behavior-change researcher. They dissect why our seemingly 'healthy' breakfasts leave us tired and hungry. Spector reveals how common breakfast foods cause blood sugar spikes and dips, while Gardner explores why changing these habits is so challenging—it's not just willpower at play. They offer practical insights into better breakfast choices and how to establish healthier routines to kickstart your day.
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Breakfast Shapes Your Day’s Metabolism
- The first meal of the day strongly influences your blood sugar, energy, mood, and hunger for hours after eating.
- A high-carb, processed breakfast can trigger sugar spikes and later crashes that undermine metabolism and cognition.
Tim’s Glucose Spike Test
- Tim Spector switched from muesli and juice to higher-fat, real-food breakfasts and noticed immediate improvements in energy and brain clarity.
- He tested a day of high-sugar muffins and recorded extreme glucose spikes and a complete loss of productivity.
Habits Are Triggered, Not Chosen
- Habits are cue-behavior associations that run automatically when triggered by a situation or environment.
- You often act by habit rather than conscious choice, which explains mindless breakfasts and unwanted routines.




