Around the 36 lb mark is exactly where I kept a stash in the car too, since my lightheaded episodes tended to hit mid-morning after long drives. Something small before coffee made all the difference for me as well.
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Around the 30 lb point my lightheaded moments also came mid-morning, so I started packing a granola bar in my bag before errands. Fatigue never really hit me but I noticed bigger appetite dips on higher doses. The stash-everywhere approach seems to be the common thread here.
Down 71 lbs and I still keep cashews in my glovebox because mine hit around hour three if I wait too long. The empty-stomach dizziness was my biggest early lesson too, one bite of anything beforehand and it basically stopped happening.
Stash-everywhere club is real, I've got almonds in my car and desk and my wife's purse. Empty stomach lightheadedness got me too until I started eating even a few crackers first thing, and the fatigue on my step up to 15 faded once I upped protein like you said. Down 37 lbs and still learning something every bump.