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The diet drinks are relatively harmless I think, unless it causes you to have cravings for other things.
A can of caffeine free Diet Coke is pretty helpful for me to ward off a sweet craving on some evenings.You’ve likely shed a lot of stored glycogen/carbs, and body is retaining less water. Which would explain the thirst. A Keto/low carb diet tends to shed you of excess water, and you feel dehydration more than if you were holding 2l of water from the large bowl of pasta that you had last night.
The wall that you feel is very common on Keto. Your body’s glycogen reserves are depleted, and you’ve not yet got very good and producing or using ketones.
The low intensity ‘fat burning zone’ should be fine, but it’s very easy to bonk on Keto.
Acliff
After joining the forum way back in 2008 I dropped steadily from 90 down to a range since 2011 of 72-75kg more, having a child on 2019 and resulting drop in time to exercise meant I got up to 80kg by the start of lockdown, held steady until I ran a marathon last year where I worked hard to get down to 74 ish again, and then between April and December got up to 88kg. The annoying thing is that I feel fat but fit in that I do at least an hour of exercise per day, I can run sub 20 mins for 5k and close to 4w/kg ftp, avg steps are >12000, so it’s not that I’m not getting enough exercise so must be food/booze.
I’ve got into a habit of drinking a lot of diet fizzy drinks in lockdown so I’ve cut those out, have banned drinking non-Thursday including alcohol free beers, and late night snacking.
I’ve also started doing a low calorie/keto diet that I plan to follow for around 4 weeks to have a bit of a kick start to weight loss.
One week in, and I’ve lost a pretty crazy 4.5kg, 1.5cm from my waist but it is bloody hard in terms of I hit a real wall about 30 mins into exercise, if I keep it low intensity (hr <140 or so) then it becomes manageable, and it’s much worse running than riding, also seem to be much more thirsty than I ever remember being…
Anyway sticking with this for a few more weeks, while I try to figure a routine where I get to do all the things I like, but in moderation, but fit my clothes, don’t get sweaty when going for a walk and am generally a fair bit healthier..
Hope is to get to around 80 by end of January , then set about getting the rest of the way down to old me weight by the end of the summer.