Fasted training may increase hunger, increase Calorie intake and decrease energy expenditure after training.

(Frampton et al., 2022)

A lot of people do fasted exercise expecting a greater fat loss. However, in 2014, Schoenfeld et al., found no significant difference in fat loss with fasted training compared to exercising after a meal.

Frampton et al., (2022); a Meta-analysis of 23 studies investigated the acute effect of fasted exercise on energy intake, energy expenditure, subjective hunger, and gastrointestinal hormone (mainly hunger hormones) release compared to fed exercise.

Findings
-Subjective hunger was higher after fasted exercise even after having a post-workout meal compared to fed exercise without post workout meal.
-Fed exercise with a standardized post-exercise meal resulted in the lowest energy intake at the ad libitum meal served following exercise completion.
-Fasted exercise without a standardized post-exercise meal resulted in the lowest within-lab and 24-h energy intake. But also produced the lowest energy expenditure and highest hunger.

Practical Applications/What the results mean to us
-The authors found a high risk of bias in measurements, so the data’s validity is questionable.
-Just keep that in mind, if you feel hungry more than usual after fasted exercise, maybe don’t do fasted training.
-Fasted Cardio doesn’t seem to provide an advantage for fat loss compared to fed training.
-Fasted weight training is inferior to fed weight training.
-Overeating is more likely to happen when you are not aware of your energy intake.

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Reference
Frampton J, Edinburgh RM, Ogden HB, Gonzalez JT, Chambers ES. The acute effect of fasted exercise on energy intake, energy expenditure, subjective hunger and gastrointestinal hormone release compared to fed exercise in healthy individuals: a systematic review and network meta-analysis. Int J Obes (Lond). 2022 Feb;46(2):255-268.