@GremlinWrangler's answer to How can an Astronaut survive for six days inside a Spacesuit? includes the following:

make sure the suit can provide air and water, and adjust the temperature to minimize calorie consumption and then just wait and let body go into survival mode.

Question: What's the best (least worst) temperature to expose an astronaut to, to minimize calorie consumption and/or to make them the most comfortable while spending six days inside a space suit in "survival mode"? If I understand correctly, they aren't floating naked in the air inside the suit, but instead wrapped with something, possibly the liquid cooling system, so I'm not even sure which temperature I'm asking about; the astronaut's skin temperature, or the liquid, or the air.

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    $\begingroup$ The best temperature for a 40 kg female and a 90 kg male astronaut may be different. Surface to volume ratio is different and also the ratio of body fat to muscles. $\endgroup$ – Uwe Oct 23 '19 at 10:50
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    $\begingroup$ I suspect the data on this would come from care instructions of hunger strikers, but not planing to go searching down that rather depressing rabbit hole. Would suggest your question is about skin temperature, you want to hold it at the point that the (greatly slowed) critical metabolic processes are enough to keep the core at 37c on waste heat without additional energy being burned. Ideal will probably involve different temperatures for limbs, core and possibly head. $\endgroup$ – GremlinWranger Oct 23 '19 at 10:52
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    $\begingroup$ Somewhat related: Apollo allowed for a 115 hour contingency return scenario where the crew had to stay in the suits that long. space.stackexchange.com/a/33883/6944 $\endgroup$ – Organic Marble Oct 23 '19 at 15:26
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    $\begingroup$ For six days in a survival situation food is unimportant so long as the temperature is reasonable. $\endgroup$ – Loren Pechtel Oct 24 '19 at 5:27
  • $\begingroup$ @LorenPechtel That's a great point! Except for the unpleasant effects, not eating (and therefore not producing additional solid waste) is probably a good thing. $\endgroup$ – uhoh Oct 24 '19 at 8:37

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