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It is not "natural" for us to moderate our eating habits. It is not "natural" to avoid refined sugar and refrain from consuming it. It is not "natural" to eat things like pine nuts and drink things like green tea while not eating quantities of "natural things" like breads, cheeses, and pizzas. We grew up with soft drinks. Most of us didn't drink tea until we were adults, if we do now. What makes it so difficult to change is that all around us society goes on consuming what we should not consume and encouraging us to do so in many different ways from advertising to coffee hour at church.
Medical science may yet come up with a way for us to lose weight without giving up our culturally driven bad eating habits—probably will. But, until that time comes, we best be working on changing our eating culture collectively. We need the same cultural changes in attitudes and behaviors that have transformed smoking from desired to disgusting. Amen.