Fat cells are filled with droplets coated by molecules that act like hotel doormen: These 'doormen' control cellular access for nutrients as well as for the exit of energy-supplying molecules called lipids. In healthy individuals, outgoing and incoming traffic in fat cells is finely balanced, supplying energy while preventing excessive spread of undesirable fat in the belly.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/01/200110073742.htm
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