The optimal zone for nutritional ketosis, according to Doctors Jeff S. Volek Phd and Stephen D. Phinney MD, PHd, is between 0.5 and 3.5. Further information is available from their book:
The Art and Science of Low Carbohydrate Living.
Suggested testing times:
First test: before breakfast. Ideally allowing one to two hours, to compensate for the naturally occurring glucose rise upon awakening. This will give you your baseline for the day.
Second test: just before your evening meal. Generally ketones will be at their peak.
Insight testing: after eating test at 30, 60 and 120 minute intervals to observe which foods affect your ketone level.
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