Recently I've been learning about Himalayan crystal salt (if you're not using this, you're severely missing out!). Based on an understanding of the composition of our body (almost entirely water and minerals) I've come to the conclusion that you don't need to "eat large amounts of food" like is stated everywhere when it comes to maintaining body mass.
I've yet to fully test this as I'm still a fair noob, but from what I gather what truly determines overall health, period, is your body's water level, its water quality, its mineral level and its mineral quality. Behind every process you do, every single one, is a water molecule. Within every one of your cells is a concentration of salt water (84 minerals) and its movement within your body is pretty much exclusively what gives us our energy and our power to live. Everything else we take in simply either provides building blocks (like fat, protein, vitamins, hormones etc) or is garbage.
Ensuring you eat clean foods, regularly supplement generously with Himalayan crystal salt (all 84 required body elements combined into a perfectly charged crystal structure) and drink lots of high quality water, things should work out just fine. That's even if your fat, protein and carb levels and intakes aren't ideal. Its truly minerals and water, the buzzing chemical electricity of the sea that matters far above all else.
With todays food, even if its high quality, a lot of the minerals can be too large, too uncharged (uses your own bodies life force to power them up to be usable, unlike the crystal salt, which creates an energy deficient, not a gain) or of the wrong type for us to even use them. The most they can do is uselessly circulate in our blood. The proper type of minerals found in this salt have been compressed into such a tiny structure that each and every one of those 84 elements, when broken apart by your body, can go directly into every cell and every part of your body, providing the absolute perfect substance.
Oh and as a side note, since starting to give it to my ferrets four days ago (also when I started), they've been twice as playful as usual, and with twice the intensity! Its also self sustained a lot now, whereas before I had to be the third party keeping the...Party, going. Mind you, also, that this is also, STILL, after a year of them eating only different types of raw meats, and eggs, with bone and organs. Organic, as well. So even with such a high quality diet for so long, I've already witnessed a massive change.
I feel it greatly within myself, too.
I feel better in every way. I'm convinced high quality water (this includes foods, which are mostly all water!) and minerals (and a combination of the two you let sit and charge up called Sole) is the absolute key to gaining strength, mass, health, vitality! Its our very core, and we're pretty much entirely that core.