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Clinician handoff

Keto

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 fog changed when I started low carb, and I want to discuss whether this looks like keto adaptation, electrolyte loss, or a different cause that the diet simply exposed.

What would weaken it

  • -No timeline linking the fog to carb restriction, keto transition, or electrolyte loss after diet change.
  • -The symptoms persist despite adequate electrolytes and a settled diet or were already present before keto.
  • -Thyroid dysfunction (low T3) explains the fog better than keto adaptation.
  • -Blood sugar issues, overrestriction, or another cause explains the pattern more convincingly.

Key points to communicate

  • •I want to know whether this is simple keto adaptation, electrolyte depletion, or a different problem uncovered by the diet.
  • •Please separate low-carb transition effects from hypoglycemia, thyroid, and eating-pattern stress.
  • •I'd like to discuss whether my current medications interact with a ketogenic diet - especially if I take diabetes medications, diuretics, or antiepileptics.
  • •If keto is the cause, I want the cleanest way to test that without guessing blindly.

Bring this to the visit

  • •A description of your current diet: macros, how long you have been keto, and whether you cycle.
  • •Electrolyte supplementation details: sodium, potassium, magnesium intake.
  • •A timeline of when fog started relative to starting or modifying the ketogenic diet.
  • •Any blood work: glucose, ketones, electrolytes, thyroid panel.

Useful screening structure

  • -Blood or urine ketone monitoring to confirm you are actually in ketosis.
  • -CMP to check electrolyte status, especially sodium and potassium.
  • -Thyroid panel if prolonged keto - some evidence of T3 suppression with very low carb.

Tests and measurements to discuss

Electrolyte panel (sodium, potassium, magnesium - if fog persists beyond 2 weeks)

What this helps clarify: Intracellular magnesium - serum levels miss deficiency

Range context

5.0–6.5 mg/dL

How to use the result

Save the result with date and symptoms from the same week.

Thyroid panel (TSH, free T3, free T4 - keto can lower T3 conversion)

What this helps clarify: This panel helps frame whether the story fits thyroid slowdown, conversion issues, or a closer competitor cause before you default to broad lifestyle explanations.

Range context

Panel context

How to use the result

Ask which thyroid number best fits the way your fog shows up day to day.

Fasting glucose (rule out hypoglycemia, especially with diabetes history)

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.

Complete metabolic panel (CMP - broader screen including kidney and liver function)

Blood ketones (optional - confirms nutritional ketosis if transition seems abnormal)

Questions to ask directly

  • •Could my fog be from electrolyte depletion rather than the keto diet itself?
  • •Should we check thyroid function given prolonged carbohydrate restriction?
  • •Am I in actual ketosis, or am I in a no-man's-land of moderate carb restriction?
  • •Would cycling carbs or targeted keto be safer for my cognitive function?

Functional impact snapshot

  • -Track fog severity during the adaptation phase (weeks 1-4) vs after adaptation.
  • -Rate cognition on days with adequate electrolyte supplementation vs without.
  • -Note whether adding targeted carbs before cognitive demands helps performance.

Escalate instead of self-managing if

  • •Severe electrolyte imbalance symptoms: muscle cramps, heart palpitations, confusion.
  • •Persistent fog beyond the expected 2-4 week adaptation period.
  • •Signs of disordered eating or excessive restriction triggered by the diet framework.

Peer-reviewed references

  1. 1. HTTPS://PUBMED.NCBI.NLM.NIH.GOV/40206956/ [DOI]
  2. 2. HTTPS://PUBMED.NCBI.NLM.NIH.GOV/41486865/ [DOI]
  3. 3. HTTPS://PUBMED.NCBI.NLM.NIH.GOV/23801097/ [DOI]
  4. 4. Skartun O, Smith CR, Laupsa-Borge J, Dankel SN. Symptoms during initiation of a ketogenic diet: a scoping review of occurrence rates, mechanisms and relief strategies. Front Nutr. 2025;12:1538266 [DOI]