Went on a ketogenic diet for a month, the weight loss slowed when I started working carbs back into the diet but I felt much better. The lack of carbs, which convert to sugar and are stored in the muscle tissue, cause the muscles to lose most of their ability to retain water. This makes hydration more difficult. Dehydration causes the headaches. The loss of water in the muscles accounts for much of the early rapid weight loss, but the body does move to a greater metabolism of fat as well. The slowing of the weight loss when resuming carbs is the flip side of the muscles dumping water, they start to retain again, which is not a bad thing as it helps you stay hydrated.
Ran a really fast (for me) 5 miles this morning, don't think I could have performed at the level I did on the ketonic diet.
The headaches are caused by lack of potassium, salt and magnesium. The thing Ive found thats best to keep them in check is pickle juice. A half cup does the trick usually. I drink lots of water. I started it because I hit a wall I couldnt break through at 200-205. Down to 194. Was 278 14 months ago. I havent noticed any decrease in strength while lifting and have actually shave ove 14 seconds per mile off my runs. I generally fast from 8pm till noon the next day. I workout hard for about 3 hours in the morning. Havent been hungry and its nice to eat foods I havent had in a year and still drop weight. Actually consuming more calories per day then my most loose diet stretches. I keep my total carbs at 10-11 (I dont do the net carb thing). I use my fitness pal to track my macros. 75%fat, 23%protein, and 2%carb. My gram goals are 163 fat, 114 protein, and 12 total carb. Ive done a lot of research to come up with that combo specific to me and my exercise regimine and its working well for me. The purpose of the fasting is that it boosts testoterone and hgh (hgh almost 2000%). Important not to over do protein on keto. Bad for the kidnys. Im putting on muscle weight at that protein level. Tracking things pretty specifically.