The energy demand someone has is dependent on their lifestyle and especially their exercise routine. Have you ever noticed that people who do yoga "slow movers" tend to gravitate towards a vegetarian type lifestyle and those who do high intensity exercise "fast movers" gravitate towards a more meat based diet? Many people think this is just the culture of yoga, be vegan, do yoga, wear Lululemon and drink coffee. But there is a lot more to the story!
The way you exercise causes your body to require and crave certain nutrients. When someone is doing high intensity exercise their body is going to need more protein for recovery, if they don't get protein for recovery then their body is going to break down their own muscles internally, which is not a good thing if you are trying to get into better shape! Because of this, people who are doing higher intensity exercise typically crave and do much better off of a higher protein diet. If you feed them salads and chia seeds all day long it's not going to give them the required nutrients they need for healing and recovery.
On the other hand, people who do yoga and move slow don't break down their muscle tissue as much and don't require as much protein so they gravitate towards a vegetarian type diet and less food in general.
If you have a lifestyle of high intensity type exercise with days of slower movements like yoga then you would want to alternate your eating patterns. In general eat more food on days you are working out with more intensity, especially right before and after your workout. And on days you are working out less or or with slower movements eat less food!
*Note, this picture isn't me. I would have a baby on one leg and a shih-tzu laying under me and toys scattered over ever inch of the floor.