It's been about a week since I read the book and started changing my diet. I did not do it to lose fat but to get away from the high and low rollercoaster associated with my body running on carb digestion and for general health. I'm really feeling great re. this.
I do two things for fitness: twice a week I do barbell free-weight training (I am not bulky at all but I like the muscle it has put on my body). Performance on this doesn't seem to suffer from the diet.
The other thing I do is short runs (4 km = 2.5 miles) with 4 to 6 sprint intervals at 30/30 seconds on/off with my SO whenever we feel like it. This would normally get me reeaaallly winded on the last interval but I always could manage to stabilize my heart rate on the remaining run towards my home. On the diet though I have to stop running completely after the third interval as I get this black-around-the-ednges-of-my-view tunnelvision and my heart rate is through the roof - and stays there for quite some time even after I slow down to a slow walk.
Does anyone have some experience on how to manage sprint-intensive sports or similar on this diet?
Help would really be appreciated!
edit: Dropping these runs is not an option.