Another word on calorie deficits. This is not as straight-forward as it sounds.
When I have a calorie deficit for a few days in a row by eating less and otherwise being at home/in bed, I get strong symptoms and the higher the deficit, the stronger the symptoms are. BUT: On some days, I can go on relatively long hikes. When I go on a hike on an empty stomach and don't eat for several hours (plus physical activity) without eating anything, I usually get no or only mild symptoms, even though the calorie deficit is relatively high.
From this, I conclude the following:
(1) Symptoms are probably not (primarily) triggered by ketones.
(2) Symptoms are absent or attenuated by physical activity during having the calorie deficit.
Interestingly, (2) should actually worsen things because it causes an even higher calorie deficit. So I think the trigger isn't the calorie deficit per se, but it is blood sugar-related. Mobilization of glycogen during exercise/physical activity seems to counteract it.
While interesting to explore, all in all, the theory behind it is actually irrelevant. The bottom line is clear: Avoid larger calorie deficits over more than a few days.
Btw, that doesn't mean I can't lose weight or be slim. I can have small calorie deficits and larger ones over just 1-2 days. With this and good food selection, I can at this point keep my weight in a healthy range (BMI 21-23).
When I have a calorie deficit for a few days in a row by eating less and otherwise being at home/in bed, I get strong symptoms and the higher the deficit, the stronger the symptoms are. BUT: On some days, I can go on relatively long hikes. When I go on a hike on an empty stomach and don't eat for several hours (plus physical activity) without eating anything, I usually get no or only mild symptoms, even though the calorie deficit is relatively high.
From this, I conclude the following:
(1) Symptoms are probably not (primarily) triggered by ketones.
(2) Symptoms are absent or attenuated by physical activity during having the calorie deficit.
Interestingly, (2) should actually worsen things because it causes an even higher calorie deficit. So I think the trigger isn't the calorie deficit per se, but it is blood sugar-related. Mobilization of glycogen during exercise/physical activity seems to counteract it.
While interesting to explore, all in all, the theory behind it is actually irrelevant. The bottom line is clear: Avoid larger calorie deficits over more than a few days.
Btw, that doesn't mean I can't lose weight or be slim. I can have small calorie deficits and larger ones over just 1-2 days. With this and good food selection, I can at this point keep my weight in a healthy range (BMI 21-23).