To maintain my weight according to the experts I needs about 1800 calories a day. I was trying to lose weight and cut it to 1200 calories per day. I found that I was fatigued and did not have the energy to perform my daily tasks. I compromised at 1500 calories per day and felt better but did not lose any weight. Now that I am attempting to go vegan I find that it is very difficult to eat 1500 calories per day. It is evening and I have eaten dinner and feel very full and yet I have only consumed about 1200 calories. I am limited on my food intake because of my food restrictions. I try to follow a low FODMAP diet. I avoid foods high in tyramines and high histamine because these foods tend to trigger my afib. I also have had issues in the past of having problems digesting beans in general and high fiber grains. I am starting to think that with my food restrictions I may not be able to go full vegan. Perhaps the best I can do is to go ovo-vegetarian or pescetarian. Regardless I do plan to cut out the grass fed beef I was eating. I stopped eating pork some time ago. I do see the benefits of going vegan, but at my age and with my food restrictions it may not be viable for me.