If you can afford it sure, talked to a friend who did the carnivore diet and he said he felt great... but also broke. xD
Interestingly enough, I save more money buying meat than all the other ingredients required for a "standard" diet. Plus, if you're not strict with what you eat, you'll probably waste money on unnecessary snacks and drinks.
It's all about looking for discounts, like stuff that's marked down due to an approaching expiration date. It's also a good idea to buy in bulk whenever there's a discount and freezing it.
I used to have a tall freezer packed with meat, enough to eat for a few months. I don't do that any more because I earn enough money to not have to bother with saving money on food. There
is a small difference in quality after something has been frozen, and it gets tiresome to eat the same few things, however tasty they may be. But, if you're tight on money, it's a great way to spend less on food, even compared to a "standard" diet.
It saves even more money for fat people, since they require less meat. I was fat a couple of years ago. Had a challenge for myself to spend as little on food as possible since I noticed that I only really needed one 300-400g meal a day to not feel hungry until the next day. I was also broke, so it really helped.
Buying only discounted meat and making use of the freezer, I had one month where I only spent 34.05 euros on food. For the whole month. Granted, I had some extreme luck with discounts, and was allowing myself to buy meat in the form of hamburger steaks and meat balls. Which are not ideal since there's some additives, but it's still better than a typical diet.
Even considering bad months with few discounts, I was able to keep the food costs under 50 euros a month. Nowadays, I don't have any extra, unhealthy fat, so I eat around double that. Got muscle mass to maintain, too.
I don't keep track of how much I spend on food now, but for a simple example of what it would currently cost me... Let's go with the worst assumptions. 1kg of meat a day. 30 kilos a month. Around here, I can get, without discounts, big slabs (~2.5kg) of "cabezada" pork in Lidl for around 5 euros a kilo. That's 150 euros a month.
Is this expensive? I'm not sure. I just know that when I lived with my parents, we were spending around 400 euros for the three of us, eating a "standard" diet.
And remember that you can save a lot with discounts, especially if you allow yourself those manufactured meat products with additives. Some are "fine", some are "no way". Really gotta read the ingredients. And anything with less than 90% meat is a no go.
The other thing to keep in mind is that fermented soy has kouji mold that adds a lot of nutrition. Kinda similar to stuff like vegemite (yeast extract) which are both intended to be low cost substitutes for meat. Japan being historically Buddhist and therefore meat was not a common part of the diet leading to many traditional soy dishes.
Modern western soy does go crazy... I get high fructose corn syrup vibes from some soy products. But I wouldn't swear off corn. =P
One's tastes really are specific to each individual's lineage. I have hunter gatherer genes, so a carnivore diet works best for me. Nothing tastes better than meat fried with salt. I
do eat more complicated meals than that, but understanding what your body
actually needs to maintain a perfect state of being is amazing.
It makes me think back to my childhood, when I hated veggies. That was my brain, immature and mostly instinctual, telling me "this won't make me strong and healthy".