Temecula, Calif. – September 18, 2026 -- Fitness 19 has released a new guide, "Is Intermittent Fasting Effective for Workouts?", aimed at helping gym-goers decide when to train while fasting.
Insulin drops accelerate fat burning during a fast
The guide explains that intermittent fasting is about timing meals, not restricting food types. When a person fasts, insulin levels drop, which speeds up fat burning. Many people notice an early dip in energy during fasted workouts, but Fitness 19 says energy levels typically stabilize after a transition period.
Muscle growth is not blocked by fasting, but protein timing matters
According to the guide, intermittent fasting does not hinder muscle growth on its own. People need to hit sufficient protein and calorie targets and schedule workouts either before or during their eating window to support muscle gains.
Eating in a narrower window naturally cuts calorie intake
Fitness 19 notes that fat loss during intermittent fasting largely comes from people naturally eating less food within a shortened eating window, rather than from fasting itself.
Workout intensity should dictate when in the fast someone trains
"You cannot approach a fasted workout the same way you approach a fed one; you need to be strategic about intensity and volume," the guide states. For strength training, Fitness 19 recommends scheduling sessions near the end of a fast so the post-workout meal can double as recovery. Low- to moderate-intensity workouts can be done deep into a fast without a performance dip, while HIIT sessions call for a shorter fasting window beforehand.