I follow all the IF threads on this forum closely, and I noticed different people post very different experiences with fasting, in particular with regard to muscle loss. Some report no muscle loss at all or slight increase, and some a very sharp and dismaying drop in LBM.
I personally tinkered with 14-18 hr fasts for a couple of weeks. I lost a visible amount of muscle and some hard-earned strength quickly. I loved fasting though because of the energy and sharpness I gained: eating every 3 hours makes me groggy throughout the whole day. I'm really longing to leave the "Tupperware lifestyle" behind...but I don't feel like I can afford to lose strength!
So I've been thinking what may be the factors involved in muscle mass gains or losses on IF, and what could have been my mistakes:
(a) Sex - I'm female. I think more females as a % have reported muscle loss.
(b) Daily activity - I'm pretty active and training sessions are long: I do Capoeira or gymnastics 2-4 hours every evening, and usually some lighter skill work in the mornings (hand balancing and more).
(c) Weight training - I don't weight train regularly, but I do plenty of bodyweight stuff (gymnastics style).
(d) Macronutrient intake - I eat low carb paleo, with plain whey PWO and a carb-up of 100g carbs from fruit/sweet potato once every 5 days. At the time I was eating about 120g protein per day (at about 115lbs BW, somewhere between 15-17% bf I guess), 30-40g fat.
(e) "Easing in" - I sort of jumped into IF from a couple years of 6 meals a day.
I'd like to hear everybody's experiences, and any comments/additions you have to the list of factors I came up with.
...Because I really want to IF like all the cool guys...