When I’m going hard for a cut I use keto strips to test. If I want to jump start I’ll fast and exercise for a day which speeds up the switch. More often you do it the easier your body switches.
I’m no expert though a lot of people simply get into very light ketosis and drop out everytime they eat, even fat based foods. Maybe I’m in that camp. Only way to truly know is to wear a continuous blood glucose monitor. I’ve never been that hardcore about it.
There was a guy on a podcast I listened to who decided to go full keto not long before going on a mountain goat hunt in central asia. He got keto flu and altitude sickness at the same time and spent the trip lying on the floor of the tent while his mates went hunting. At a guess a trip like that is $20000 plus which he will never see again and there's plenty of into that backs up what you said about it not being a diet you can decide to suddenly do.
Pack out heavy
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