As is in the case of GABA, the intracellular reactive oxygen species (ROS) hypothesis works against the hunger-suppressive role of KD: it has been demonstrated that the hypothalamic ROS increase through NADPH oxidase is required for the eating-inhibitory effect of insulin (Jaillard et al., 2009); moreover it has been demonstrated that there is a ROS-dependent signaling pathway within the hypothalamus that regulates the energy homeostasis, and that activation of ROS-sensitive mechanisms could be sufficient to promote satiety (Benani et al., 2007). On the other side, KBs decreases mitochondrial production of ROS by increasing NADH oxidation in the mitochondrial respiratory chain (Maalouf et al., 2007).

I should note that I fully believe the key to success on a keto diet is to be prepared.  If you precook your meals, you are setting yourself up for success.  You are only choosing to do keto once a week when you prepare your food. If you have no keto food at your house and its 9 pm on a Wednesday, then you are just asking to revert back to something easy like chinese food or pizza.  However, if all you need to do is pull a premade meal out of the fridge and microwave it, you are much better off. Make sure to pick up some rugged, microwaveable containers to store your food. Now then, lets get started!
Sometimes we all have leftover chicken on hand that needs to be used up. Maybe you roasted a couple of chickens on the weekend to prep for the week ahead, maybe you had company over and grilled up too many chicken breasts, or maybe rotisserie chicken was on sale at your local grocery store and it was too good a bargain to pass up. Whatever the reason, we all can use a few ideas on how to use up leftover chicken.
Scheme of orexigenic and anorexigenic effects of ketosis. The picture is highly schematic. For more details please see the text. AMPK, AMP-activated protein kinase; CCK, cholecystokinin; GABA, gamma-aminobutyric acid; BHB, β-hydroxybutyric acid; FFA, free fatty acids; ROS, reactive oxygen species; NPY, neuropeptide Y; AgRP, agouti gene-related protein.
You could certainly use butter, but I’m not sure how that would be more appealing to him if he thinks fat is the enemy. It’s tough to get heart patients to go against the “conventional wisdom” we’ve been fed for so many decades. They have a right to be fearful, but I would suggest offering him research that shows fat isn’t the enemy at all. For what it’s worth, after 6 months of heavy keto (my testing period, though I’ve been keto longer than that) with lots of fats, including butter, bacon, and avocados, my cholesterol and triglycerides dropped! And I’m not the only person to have those same results. Best of luck!
Before starting, ask yourself what is really realistic for you, Mattinson suggests. Then get your doctor’s okay. You may also work with a local registered dietitian nutritionist to limit potential nutrient deficiencies and talk about vitamin supplementation, as you won’t be eating whole grains, dairy, or fruit, and will eliminate many veggies. “A diet that eliminates entire food groups is a red flag to me. This isn’t something to take lightly or dive into headfirst with no medical supervision,” she says.