Yes, I have several types stashed around. I think it is a great option for taking a road trip and have an supplemental little bag I toss in the vehicle with a few things. This is one of them (some sort of chocolate hi protein meal replacement mix), along with a shaker container, water pik, TP, sewing kit, lifeboat rations, couple water bottles, some 3/8 braided rope, instant coffee, 5 hour energy, metal coffee cup, Dental floss, poncho, bottle of mouth wash, clean white cloth, 50 ft paracord, lighter, extra swiss army knife, roll of electrical and some duct tape. Couple cell phone chargers and maybe a lithium jump pack (tried to remember the contents from memory).

Edit: the shakes give you protein, the lifeboat rations are carbs and fats, and the coffee packets include sugar.
Carrying and using all 3 when needed will give you a decent mix of fuel for your body and also gives you the option to just consume the lifeboat rations if water is short. A 5 hour energy bottle will give you a blast of B vitamins for energy conversion.

 

You can even use MRS ( meal replace shake ) to extend some staple food. You could for example take rice mix in a MRS shortly before the rice was completely cooked and end up with a 'rice pudding'

 

I've been using this protein powder in MRS for over a year now and I love it. It's 0 carb and 0 sugar so it works great with my keto diet and tastes damn awesome. (cookies and creme flavor)

https://www.amazon.com/gp/product/B0015R26V8/ref=oh_aui_search_detailpage?ie=UTF8&th=1

I don't think there are any MRS that can be stored long term though as they all have some fat content to them somewhere (if someone knows of one, please link)

So as long as you're rotating through it and storing it well, I think it's a great addition to emergency preps.

 

https://www.amazon.com/gp/product/B0015R26V8/ref=oh_aui_search_detailpage?ie=UTF8&th=1

Same kind I use for my gym rat routine. That stuff is amazing!

Not for any kind of MRS though

 

Will a MRS help with losing weight (fat & water) when on a high protien/low card diet?

 

They appear to be lacking in calories. Or are expensive if you wanted to get 2500 calories per day from them. Which if you were doing physical work you would want as many calories as you can get. On the other hand as something light weight in a pack it could give you the energy you need to get where you are going and I assume it only takes a few seconds to prepare(if you have drinkable water)

 

I cannot say I store them for an "emergency food source". But, I do keep on hand a few packs for assisting convalescence.

 

I use them at the moment as part of my weight loss program and the ones I'm on now are very satisfying as far as the amount of energy and fullness I get out of each shake and they are extremely low on sugar and carbs

Extremely low in sugar and carbs would be bad news in a SHTF scenario--you'd need plenty of carbs for energy. If you aren't eating enough calories to meet your energy requirements, you are going to start "eating" your own muscles and body tissues, a scenario that ends badly in relatively short order (and puts a heavy strain on your liver and kidneys in the meantime). Once a sedentary lifestyle has to give way to one of heavy manual labor, you want lots of carbs and fats in your diet to use for fuel. Protein shakes for weight loss are low in both carbs and fat. Low in carbs to force your body to start burning fat once it has burned through its glycogen stores, and also low in fat to force you to burn body fat. Once that body fat has been burned, though, there's only body protein left to work on. Not good. (The shakes are also low in fiber, and a longterm low-fiber diet has its own bad consequences.)

Based on all that, I can't see relying on MRSs for anything other than an easy-to-store and light-to-pack survival meal or two, assuming you also have a plentiful water supply and maybe some supplementary hard candy for fast energy. (Lifeboat rations rely on carbs because digesting fats and proteins requires much more water.)

Trying to live on synthetic nutrition longterm always turns out to be a bad idea. What you should store for food is...food. Plenty of good, everyday food. Not instant-meal-in-a-glass meal replacements. Not even buckets of fake-food meals. Real meals made out of real foods. Just heavily sucralose-sweetened whey protein with added synthetic vitamins and minerals isn't going to cut it.

A ketogenic diet can be useful for weight reduction, diabetes control, epilepsy control, and in certain other situations. It must contain sufficient fat, fiber, and essential nutrients in natural versus just synthetic form, though, if you intend to live on such a diet longterm, not consist of just highly-processed liquid shakes filled with synthetics. And it pays to get a medical checkup with full bloods regularly to be sure such a high-protein/high-fat diet is compatible with your personal metabolism and genetics. We aren't all metabolically identical to Inuits or Masai, any more than we are all metabolically identical to northern Europeans or Japanese or Brokpa. Before adapting one of the more extreme human diets, it would be a good idea to make sure you have the same genetic mutations as the group who adapted over many generations to living on it, keeping in mind that those adaptatons spread among the survivors of an initially fairly high mortality rate.