The tiered structure of what is allowed
Carnivore eating is usually described in tiers of strictness. Tier 1, the most restrictive, includes meat, fish, eggs, salt, and water. Tier 2 adds dairy such as butter, hard cheese, and heavy cream. Tier 3 permits a small number of plant foods (some practitioners allow limited fruit, honey, or low-toxin plants). The further out the tier, the looser the elimination.
The shared principle across tiers is the near or total exclusion of plant foods, with animal products supplying nearly all energy and protein.
Nutrient gaps to watch on an all-animal pattern
Removing plant foods removes the main dietary sources of fiber, vitamin C, and many polyphenols, and can lower potassium and magnesium intake. Proponents argue animal foods supply these adequately, but evidence on long-term completeness is limited and contested. Variety of cuts, including organ meats, is often emphasized to broaden the micronutrient profile.
This is general educational information, not medical or dietary advice. Highly restrictive diets can risk nutrient deficiencies and may be unsuitable for some conditions, so a qualified professional should be consulted before starting and for monitoring.