Smoothies are very high in sugar content, so if you're aim is to lose weight they are a bad option. Eating lots of fruit, which I do enjoy myself is good for vitamin intake but most fruits are naturally high in sugar.
The five a day thing falls over as there is no scientific logic that can be applied to it. It's really just marketing. For instance an average sized orange contains more calories and sugar than a two finger kitkat. Is an orange healthier? Well yes, as it provides vitamins that the body needs. Will eating an orange rather than a kitkat aid weight loss? No, it wouldn't. Also look at the marketing hype on many store products that have massive "low fat" labels. Low in fat sure, but for many then go compare the sugar content versus the full fat version. Pretty much without fail the full fat version is lower in sugar.
No wonder people get confused when they are bombarded with "healthy" and by healthy they really mean weight loss aiding products that aren't actually going to aid weight loss.
EDIT: I'm not saying fruit is bad for you. What I'm saying if your goal is weight loss then many popular fruits aren't the best option. There would be far less calories and sugar in pretty much any vegetable than there would be in fruit. The point I'm making is we are selling a flawed concept with this five a day, which companies have picked with and now brand their products with such as smoothies.
Edited: 13/09/2012 at 12:18