I was able to sustain a severe calorie deficit with lots of 700 calorie cardio days per week for a few months. And it didn't feel really bad. I had a lot of energy and mental clarity. I was fasting 2 to 3 days a week.
I was on medication tho that elevated my heartrate and I became numb to food. Zero appetite. I could have sustained it a bit longer, I had a major suicide attempt though. Which caused a lot of damage.
I should have added at least 500 calories to my diet based on how much I was working out.
So I want to say it's possible. It's dangerous.
It's also dangerous to work out hard enough to expend an additional 1k calories per day. That's combat levels of metabolic stress and damage. It will shorten your outside lifespan range. Your skeleton will take a beating. Like consuming and burning 6k calories a day is absolutely insane.
If u are into life extension, extreme caloric restriction is the way ppl go.
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