He didn't tell her of his escalating concerns over the Shipton case, nor, surprisingly did she ask about it.
Fatty tissue is more likely to be resistant to the effects of insulin, causing escalating glucose levels.
The only way to maintain the initial effect of spanking is to increase its intensity, which runs the risk of escalating to abuse.
E., et al. "The Escalating Pandemics of Obesity and Sedentary Lifestyle."