Are Artificial Sweeteners Safe During a Cut? A Glucometer Test

The concern about artificial sweeteners during fat loss comes down to one question: do they cause an insulin response?

If they do, they would suppress lipolysis — fat burning — despite containing no calories or sugar. This would make them counterproductive during a cut.

The research is messy.

The PopMech Study and Why It Doesn't Apply

One frequently cited study showed artificial sweeteners causing significant insulin increases. But:

• The experiment used rats, not humans
• The sweetener was administered intravenously, not consumed orally
• The dose was approximately 150mg per kilogram of body weight — for a 100 kg (220.5 lbs) person, that's 15 grams, or roughly 250 tablets consumed simultaneously

No meaningful conclusions about human physiology come from intravenous administration to rats at doses 250x what a person would realistically consume.

The critical missing factor: taste receptors.

The Pavlov Dog Problem

The study's rats got sweetener directly in the bloodstream, bypassing taste receptors entirely. But human sweetener consumption works through the mouth, stimulating taste receptors first.

Could the sweet taste stimulus trigger a conditioned insulin response — like Pavlov's dogs salivating at a bell? Pavlov demonstrated this mechanism clearly: a repeated pairing of stimulus and physiological response eventually produces the response without the genuine trigger.

If humans who regularly consume sweet foods have developed a conditioned insulin reflex to sweet taste, sweeteners might trigger it — even without actual sugar reaching the bloodstream.

The Practical Test

A glucometer directly measures blood glucose after sweetener consumption. If insulin is secreted in response to the sweetener, blood glucose will drop — a clearly readable "dip" on the measurement curve.

Test protocol:

• Fasted state
• Baseline blood glucose measurement
• 10 sweetener tablets consumed
• Blood glucose measured every 15 minutes for one hour

Result: no measurable glucose drop. No insulin spike observable.

Second test conducted during the end of a 6-8 week cutting phase — genuinely hungry, deprived of sweets for weeks, maximizing any conditioned salivary/insulin response to sweet taste:

Result: the same. No meaningful glucose movement from sweetener consumption.

The Conclusion

Artificial sweeteners, at normal consumption doses, do not appear to produce an insulin response in humans through taste receptor stimulation. They are safe to use during a cut without disrupting fat burning.

Caveat: individual variation is possible. If you want certainty for your own physiology, a glucometer test is cheap and definitive — measure fasted blood glucose, consume sweeteners, measure every 15 minutes for an hour. The answer will be unambiguous.

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