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A common concern is frostbite, or other damage to the skin. This is not a problem, as you need far colder temperatures (-10c/14f) to cause that type of damage<ref name="CryoSkin"/><ref name="CellDeath"/>. CoolSculpting uses temperatures that do not immediately kill off the fat cells, but rather trigger the natural process of cell death([http://en.wikipedia.org/wiki/Apoptosis apoptosis]). That's why CoolSculpting takes weeks or months for the full effect to be seen.
=CoolSculpting compared with Cryosurgery=
CoolSculpting is quite different to Cryosurgery, which uses cold to kill off tissue, such as tumors. Typically cryosurgery uses far lower temperatures (-20c/-4f to -40c/-40f) and immediately kills off the living cells ([http://en.wikipedia.org/wiki/Necrosis necrosis]) <ref name="CryosurgeryTemp"/>. Cell damage is caused by temperatures below -10c/14f<ref name="CryoSkin"/><ref name="CellDeath"/> and CoolSculpting only drops the temperature to around -1c/31fdoes not go that cold.
=Side effects of CoolSculpting=
There have been no serious side effects reported so far<ref name="ClNelson"/>. The skin being treated goes red, with some bruising and numbness. I suspect that the bruising may be because the CoolSculpting device sucks<ref name="CsSuction"/><ref name="CryroNerves"/> the fat against the cooling device. These problems normally resolve within a week. Studies have shown no changes in blood lipid levels or liver function<ref name="CyroMeta"/>. The numbness is not associated with nerve damage<ref name="CryroNerves"/>.
CoolSculpting reduces the fat thickness in the limited area that is treated rather than producing overall weight loss<ref name="ClNelson"/>. CoolSculpting does not seem to be effective in obese people, though it may simply be harder to observe the effects<ref name="ClNelson"/>. It's worth noting that CoolSculpting reduces the fat thickness in people who have a stable weight; in other words, you don't need to be on a diet for it to work.
=How long does it take to work?=
The effects of CoolSculpting should start within a few weeks, but the full effect may take 3-4 months<ref name="CsPig"/>. Tests indicate that the changes are noticeable after 2-7 weeks (average 4 weeks)<ref name="CryroChin"/>.
='DIY CoolSculpting'=
Having reviewed the evidence for the commercial CoolSculpting, I wondered if it would be possible to replicate the effects by simply applying ice to the skin. An early study of CoolSculpting showed a reduction in the fat levels from -1c/31f, though not as great a loss as colder temperatures<ref name="CryoNovel"/>. The levels of fat on my legs are noticeably lower than other parts of my body, which might be the result of regular icing. There is evidence that applying ice to the skin produces an inflammation response in just a few minutes<ref name="CyroMeta"/>, so this approach seems viable. '''Use only ice cubes in a bag. Do not use gel packs as these are cold enough to cause skin damage.''' For more details, see [[Cryotherapy]].
