Fasting and thermogenics pair naturally on paper and unpredictably in a stomach.
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Does it break a fast
A capsule contains negligible calories and will not meaningfully affect a fast in the sense most people care about. If you are fasting for weight management rather than a specific medical protocol, this is not a real concern.
The empty-stomach problem
A concentrated caffeine dose without food causes nausea, jitteriness and stomach discomfort in a significant minority. Fasting amplifies this. If you take it at 7am during a fast that runs to noon, you are taking a stimulant under exactly the conditions that make it least comfortable.
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Get SodaSlim — From $49The appetite argument in favour
Caffeine has a mild appetite-suppressing effect and the Garcinia component targets satiety, both of which make the fasting window easier to hold. For someone whose fast collapses at 11am, that is a genuine, practical benefit.
The sensible compromise
Take it at the start of your eating window with the first meal rather than during the fasting window. You keep the appetite support for the afternoon, avoid the empty-stomach reaction, and still get the dose in early enough to protect sleep. See our fasting guide and the dosing detail.

Editorial note: This article is general information, not medical advice. SodaSlim contains caffeine and is not suitable for everyone — see who should not take it and our full disclaimer. Individual results vary and no outcome is typical or guaranteed.
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