For today’s edition of Dear Mark, I’m answering four questions. First up is from Milad, who wonders about the recent research seeming to show that fish has little to no effect on heart disease. Is it right? Are we wasting money and enduring fish burps for nothing? Next, how low is too low? If a person’s eating 1500 calories and feeling completely satisfied, should he preemptively increase calories before bad things start happening? After that, I give a couple tips for breaking through a weight loss plateau. And last, how does Bulletproof coffee “fasting” compare with actual intermittent fasting? Is it a better alternative?