Feb 23, 2012 This is my first time running keto and it's giving me some horrible fatigue. I expected some loss of strength and endurance, but at 5 days in I can barely get out of bed in the morning. During the days my legs feel like they're always about to buckle right under me. I really want to make this diet work, but I can't keep this up much longer. I'm planning to carb up on Saturday and see how that affects me. I curious if anyone else has run into this and what you did to combat the weakness and fatigue.