MFP's pie graph-- how do you use it?

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Do you follow the suggested percentages from MFP? I've been cutting out sugar and lowering my carbs from grain/sugar sources. I'm aiming for 40-30-30 (carb, fat, protein) most days and a little higher (but under 50) for carbs on intense training days (I'm a distance cyclist). Just curious what others do and if it is working for you?