Jilly,
After a prolonged period of kcal restriction be cognizant of a slower metabolic rate for some time (especially if you cut more than 25-30% below your baseline, original intake or are currently more than 10% below usual body weight).
It might be prudent to keep your records pretty tight and your cardio up as you s l o w l y add calories back in to your diet. How slowly? Don’t know for sure; perhaps over a period similar to the length of the original diet? The million dollar question that no one can answer for everyone is “how long before one’s metabolism agrees to a new, truly lower body mass set point”. Genetic difference in leptin and T3 responses to dieting/ refeeding are examples of how we all differ.
After competing at extreme leanness a few times in my life, I’ve decided NOT to get too lean again (staying above 8% for me), as it starts to look like yo-yo dieting over a few years (writing a new article on this right now!). This loss/ gain cycle, even if not emotionally the same as repeat failed diets in yo-yo syndrome, could still awaken baby fat cells (“pre-adipocytes”) and leave lasting metabolic consequences.
With quality dietary and exercise choices and a patient return to higher kcal intake, I think a new body fat set point may indeed be possible, as evidenced by those few successful dieters out there.
In fact, I’d like to know what others think about the length of this vaguely defined and often ignored “post-diet” period!