Physical Fitness Stack Exchange is a question and answer site for physical fitness professionals, athletes, trainers, and those providing health-related needs. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

In my research it seems properly made meal replacement shakes with fresh fruits and vegtables and balanced for proper nutrition are healthy as a possible replacement for one or two meals a day.

However from my perception there seems to be some consensus that consuming them all them time is not ideal and consuming them for every meal is bad. However, I am having trouble finding information on why.

Wouldn't a shake have almost all necessary nutrition? Is there something inherently bad with non-solid diets?

Is it because of the lack of nutrients that are usually only maintained from non-mixed ingredients like meats?

Is it healthy to continually consume meal replacement shakes over the course of the day vs. getting the recommended 6 meals a day?

share|improve this question

closed as off-topic by Alec, rrirower, Eric Kaufman, FredrikD, LarissaGodzilla Jun 15 '15 at 12:32

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions on nutrition are off-topic unless they relate directly to exercise." – Alec, rrirower, Eric Kaufman, FredrikD, LarissaGodzilla
If this question can be reworded to fit the rules in the help center, please edit the question.

up vote 3 down vote accepted

I am pretty sure that the problem is not the fact that they are shakes. You could just put everything you would eat in a mixer instead and drink the result and I would assume that the result would be the same (maybe even a bit better since the meal is really well "chewed" which seems to be good).

The main problem you will have with ready made shakes is, that a lot of the phytochemicals in fruits and vegetables deteriorate pretty quickly once the cells have been destroyed. (And I am not talking about vitamins since those could be added pretty easily by supplementation).

Dietary fiber actually isn't a problem because you can add that very easily to a shake.

Honestly I think that you could live quite some time only drinking such shakes without having obvious malnutrition. But you can also live pretty long without eating any vegetables or fruit without having obvious malnutrition if you take vitamin supplements which doesn't mean it's a healthy behavior.

You should also consider, that making a shake that is truly nutritionally complete may just be pretty expensive and the result just might not be very tasty.

share|improve this answer

The reason is similar to why ready-cooked meals are not good for you - because they are processed and contain ingredients which are used to keep everything together for long periods of time.

e.g. if you cooked a lovely salmon steak, vegies and rice and put it in the fridge and then you bought the same ready-cooked meal and placed it in the fridge. Your home made meal would last far less time because the bought one contains special substances to keep it fresh which may and may not be good or necessary for you!

Also imagine you placed your home-cooked meal in it a blender and made it into a liquid food and then drank it you would not give your body enough time to process it and absorb the nutrients as it would flow through you system much faster.

Also if you placed that processed meal in the fridge you could only leave it there a few days - meal replacement drinks are in power form and can last months because they have ingredients to keep it from going bad.

share|improve this answer
Instead of simply down voting, at least ad a reason. I can guess who it was though, as he has been down voting every single answer of mine – TheLearner May 29 '12 at 9:54

I'd hazard a guess that it is to do with the healthy functioning of the colon

share|improve this answer

Use a meal replacement shakes for no over 2 meals, or one meal and one snack, per day, unless you are closely supervised by your doctor.

Choose meal replacements shakes that contain a minimum of two hundred calories. They ought to even have a balance of carbohydrates, proteins and fats to produce adequate nutrition and reduce between-meal munchies.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.