But Spalding says the fact that the body keeps up the fat cell production even during weight loss could be one reason why people find it hard to keep off any weight they lose.

• 术后体重的降低是由于他们的脂肪细胞收缩，但是细胞的总量维持不变。这指示即使人吃的更少，他们的体内仍然继续产生新的脂肪细胞来保证数量水平不变。