I'll say up front that the UD2 is not an easy diet. You'll have to count/decrease calories and carbohydrates 3-5 days out of every 7. While you don't get to eat everything in sight on the other days, it'll sure seem like it. On some days you can even eat some junk food.
If you use the fat loss variant, you should be losing a pound or more of fat per week, while
gaining some muscle. At the very least you'll maintain muscle without loss which can be an improvement for most people. Performance athletes can lean out while maintaining or even increasing performance as well. For the muscle gain variant, it's a little harder to predict. Women, of course, will have slightly smaller changes overall for what should be obvious reasons.
Despite what you may be used to, you'll only be lifting 4 days per week. Each workout should take about an hour or so, with one running maybe an hour and a half. If you can't find 4 hours per week to train consistently, this diet won't do you much good. Cardio is optional for men, but generally necessary for women to lose their lower bodyfat at any decent rate. Still, you shouldn't need a ton of cardio with this diet, not nearly as much as you think anyhow.
There are only one or two required supplements, although there are some that can be genuinely helpful. Beyond that, the diet revolves around basic foods that you can get at any supermarket (I assume that bodybuilders and athletes have no problem with protein powder). While I'll mention drug options to further optimize the diet, they are by no means required.
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