One large meal sends all your energy to the digestive system and leaves you sleepy for the afternoon, which is the argument the raw food post makes here. It is the only piece written by somebody describing their own experience, and it concerns performance across a day rather than weight on a scale.
The rest gathers business and self improvement advice from the usual sources. A few instructions still earn their place. Use a post office box rather than your home address on business correspondence, because the address itself tells people how seriously to take you. Deal with interruptions from family before they become the reason nothing gets finished.
The self improvement material names stress as the thing standing between you and thinking clearly, and it recommends choosing books that suit your actual age and circumstances rather than whatever everybody happens to be recommending.
Most of the writing was assembled from elsewhere and reads that way.
Take the raw food post first. It is short, it is specific, and you can test it against your own afternoons.