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2500 kcal of spinach is... (searching web)... 10.8 kg. That's... that's just... wow. 85 liters of spinach. That's like eating more than half of a short (36") bale of hay.

~So yeah, not inherently obesity-preventing.~

The downside is that you will be consuming about 80 grams of oxalic acid. The LD-Lo is 600 mg/kg, meaning that unless you are 135 kg (300 lbs), that much spinach could possibly kill you. Aside from bursting your guts from the inside from the sheer volume of it, that is.

I guess the steaks just kill you more slowly.

I didn't literally mean replace meat with spinach. It was an example to show that vegetables are more expensive than meat.

That's almost exactly what cows do. Eat 10-20lbs of grass per day and gain a couple of pounds of weight.

Of course, cows are "designed" to do this, while people seemingly are not.