Well you definitely don't wanna go on just a liquid diet. Not good for you at all. I tend to eat a meal then have a shake, and switch off throughout the day. Of course for me they're weight gainers and that's so i can gain some muscle. But for you, since you're trying to lose, if you get lazy sometimes just replace your meal with a shake. Don't do it for every meal though, make sure you get enough solid foods.