Of course eating meat is natural. But you can't live solely on meat. We are designed to subsist on a plant based diet which can be supplemented by meat. But meat is in no way essential for health.
You can survive without meat just fine but you can't survive without vegetables unless under specific conditions, such as Inuits who have evolved to suit a carnivorous diet over thousands of years, and the cold weather means that the increased fat intake is burned off just keeping warm, yet they still have a much shorter life span than other races(a good 20 years less than the average global lifespan). A non-Inuit person attempting to live the same lifestyle will have a lot more health issues and an even shorter lifespan.
People have been living on vegetarian diets for many thousands of years, which means some ethnic groups with a longer history of vegetarianism are better suited to it than others and so it could be considered "more" natural for them.
The truth is that a vegetarian diet is natural, and so is an omnivorous one.
The theory that humans evolved large brains and hands suited to manipulating objects and making tools because of hunting is outdated, and only one part of a much larger picture. Digging for starch rich plant roots and tubers and cracking nuts also rich in starch are just as big an influence, if not more so.
We have 10 times the amount of amylase(converts starch into usable sugars) in our saliva than a chimp, simply because a chimp for example doesn't dig for roots as a major source of food. Few animals are better adapted to eating starch-rich foods like grains, tubers and nuts than we are, these foods, being energy rich like meat, don't require a long digestive tract to process, so are a major reason why our digestive tracts are shorter than a herbivore or even a fruitivorous animal.
Our short digestive tract isn't in and of itself evidence that we should be eating meat or even entirely as a result of a history of eating meat, although it was obviously a factor.
We don't digest meat as efficiently as most other omnivores, because we've evolved to eat it as a suppliment, not a base upon which our entire diet is formed. We are designed to eat a starch and fruit based diet, combined with a fair amount of green plant matter. Whether or not it's supplemented with meat is optional, and not always necessary.
While nether a vegetarian nor an omnivorous diet is unnatural, a vegetarian diet(for most people) is more natural than a carnivorous or predominantly meat-based one. It comes down to a matter of ethnicity and genetics when you are talking about specifics.