QUOTE from Dr Fung (emphasis mine):
“Blood glucose levels remain normal as the body switches over to burning fat for energy. This effect occurs with fasting periods as short as twenty-four to thirty-six hours. Longer fasts reduce insulin even more dramatically. More recently, alternate daily fasting has been studied as an acceptable technique for reducing insulin levels.7
Regular fasting, by routinely lowering insulin levels, has been shown to significantly improve insulin sensitivity.8 This finding is the missing piece in the weight-loss puzzle. Most diets restrict the intake of foods that cause increased insulin secretion, but don’t address insulin resistance. You lose weight initially, but insulin resistance keeps your insulin levels and body set weight high. By fasting, you can efficiently reduce your body’s insulin resistance, since it requires both persistent and high levels.
Insulin causes salt and water retention in the kidney, so lowering insulin levels rids the body of excess salt and water. Fasting is often accompanied by an early, rapid weight loss. For the first five days, weight loss averages 1.9 pounds (0.9 kilograms) per day, far exceeding the loss that could be expected from the caloric restriction, and is probably due to diuresis. Diuresis reduces bloating and may also lower blood pressure slightly.” 
NOTE (my commentary)
Blood glucose levels remain normal as the body switches over to burning fat for energy.
insulin resistance keeps your insulin levels and body set weight high.
What gets my attention?
Do I understand the need or problem?
Do I understand the potential solution?
Do I understand how to apply that strategy?
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SOURCE – Footnotes:
 “The Obesity Code: Unlocking the Secrets of Weight Loss” by Dr. Jason Fung, Timothy Noakes, page 240.
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Key: Fung-10-30.65 Last Revision: 02/02/2021