Clinician handoff
Sugar
Designed for a 60-second scan in primary care. Use this to explain why this theory fits, what would weaken it, and which tests are most worth discussing.
Why this still fits
My brain fog has a clear post-meal pattern - it spikes 1-2 hours after eating, especially after carbohydrates, and is worse when I skip meals. I want to check fasting glucose and HbA1c, and discuss whether glucose variability rather than average levels is the issue.
What would weaken it
- -No meal-timing pattern, no crash window, and no change with food composition or fasting state.
- -Normal glucose context plus a story that doesn't track with eating at all.
- -Sleep apnea, cortisol, meds, or another cause explains the pattern more cleanly than blood-sugar instability.
Key points to communicate
- •I want to know whether this is reactive hypoglycemia, insulin resistance, diabetes-range dysfunction, or something else entirely.
- •Please separate meal-linked crashes from anxiety, cortisol swings, and medication effects.
- •If sugar is central, I want the most useful measurements to track instead of guessing from symptoms alone.
Bring this to the visit
- •A 3-day food diary noting sugar and refined carbohydrate intake with timing.
- •A description of post-meal symptoms: fog, crash, energy dip, irritability.
- •Any blood sugar data: fasting glucose, HbA1c, or CGM readings.
- •Medication list and any family history of diabetes.
Useful screening structure
- -Fasting glucose and HbA1c as baseline metabolic assessment.
- -2-hour oral glucose tolerance test if reactive hypoglycemia is suspected.
- -CGM (continuous glucose monitor) trial to correlate glucose swings with fog.
Tests and measurements to discuss
Blood Sugar Assessment
What this helps clarify: This bundle is more useful than a single glucose marker when the story suggests post-meal crashes, normal average labs with variability, or early insulin resistance.
Range context
Panel context
How to use the result
Compare average markers with symptom timing instead of treating the panel as a pass-fail screen.
A1c + fasting glucose context review
What this helps clarify: This route is for the situation where HbA1c and fasting glucose do not fully explain a strong post-meal or fasting crash pattern.
Range context
Interpret with timing pattern
How to use the result
If the averages are normal but the crashes are repeatable, ask what test would better capture variability.
HbA1c and fasting glucose
HbA1c shows 3-month average blood sugar. Pre-diabetes threshold: 5.7-6.4% (US ADA) / 39-47 mmol/mol (UK/AU/EU). A normal HbA1c doesn't rule out reactive hypoglycaemia or post-meal glucose spikes as a cause of cognitive symptoms - if post-meal fog is the primary symptom, a 2-hour glucose tolerance test captures variability that HbA1c misses.
What this helps clarify: Higher fasting glucose impairs executive function
Range context
70–85 mg/dL (optimal)
How to use the result
Save the result with date and symptoms from the same week.
Questions to ask directly
- •Is my fog from blood sugar crashes, sustained hyperglycemia, or insulin resistance?
- •Should I try a CGM for 2 weeks to correlate glucose patterns with cognitive symptoms?
- •Would a protein-first eating approach reduce post-meal fog?
- •Should we screen for prediabetes or insulin resistance with fasting insulin?
Functional impact snapshot
- -Track fog timing relative to meals: 30 min post-meal, 2 hours post-meal, fasting.
- -Rate cognitive function during a 1-week low-sugar trial vs normal eating.
- -Note whether protein or fat at the start of a meal reduces the post-meal fog.
Escalate instead of self-managing if
- •Fasting glucose >126 or HbA1c >6.5% indicating undiagnosed diabetes.
- •Severe hypoglycemic episodes with confusion, seizure, or loss of consciousness.
- •Rapid unexplained weight loss alongside blood sugar instability.
Peer-reviewed references