IMO it's not worth the cholesterol risks. Essentially...when I've read posts by people who've done an egg fast, they wind up severly restricting their calorie intake simply because it would be near impossible to get even 1000 calories on eggs alone (without making yourself sick). There may be more to it than that...but I personally think the calorie reduction plays a big part. In my opinion...a better option is to cut your calories down significantly but continue eating a healthy selection of foods. As with anything along this idea...the more you have to lose...the more effective it is likely to be in the short term.....such as a 3 or 4 day fast/restriction.