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In page Bodybuilding:

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The bulking and cutting strategy is considered effective because there is a well-established link between muscle hypertrophy and being in a state of positive energy balance.[3] A sustained period of caloric surplus will allow the athlete to gain more fat-free mass than they could otherwise gain under eucaloric conditions. Some gain in fat mass is expected, which athletes seek to oxidize in a cutting period while maintaining as much lean mass as possible.[citation needed] However, it is unclear whether one can maintain enough fat-free mass during cutting for the overall process to be worth it.[4][5]