Hi everyone, I started my keto diet today. I'm 6'1, 253lbs and I plan to get down to about 180lbs. I have a few questions, I hope you guys/girls can help!

1: Constipation: What can I do about this? Last time I was on a keto diet I didn't defecate for 5 full days. After that I only used the bathroom like once every 3 days. Urination is fine though, I did that often. What can I do to avoid being constipated and push all of the food in my system OUT!?

2: Cardio: Should I be doing some sort of cardio with my keto diet? I hear that people who work out and lift weights do a keto diet and have a "carb up" day. Will it make me lose weight faster if I do cardio+keto WITHOUT carbing up? Or is carbing up necessary when you're doing keto+cardio?

3: Stretch Marks..... : I have tons of bad stretch marks from rapidly gaining weight. I gained like 70 lbs within a matter of months from being a total fatass. I mean, I ate chocolate syrup out the bottle, and I would eat a full bag of chocolate candy every day. What can I do to get rid of these stretch marks? And are they permanent?