What are your secrets in maintaining a reasonable diet?

Everybody has little knicks they pick up along the way on how to maintain a reasonable diet like substituting non-healthy ingredients for healthier alternatives. I have just recently learn that if you put cool whip in the freezer and let it sit, it taste really good if your having a sweet tooth. Its not healthy in general but will not kill a diet your on with minimal sugar and low carbs. A hell of a lot better than getting a candy bar or ice cream.
What are your secrets in maintaining a reasonable diet?
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