Wanting sugar, salt and something sharp at the end of a punishing week is physiology talking, not a defect in your character.

What the research says

An experimental study found that a single bout of exercise before a psychosocial stressor dampened the cortisol response, with neural evidence pointing to better negative feedback in the stress axis. Exercise seems to change how a stressor lands, not only how you feel about it afterwards. That study measured hormones in a laboratory rather than eating, so the link to cravings is reasoning rather than direct evidence.

Strength of evidence: one line of research. A single study, or a theoretical account.