No single food carries everything your body needs, so the most useful question about a week of eating is rarely “was any one meal good?” but “how wide was the plate overall?” Calk reads this theme as breadth — the count of different ingredients, plant species, and protein sources that turn up across a week. Your monthly report draws all of it into a single picture — see what a Variety Map looks like.
Where a typical week's breadth tends to sit
Illustrative. The tick marks a commonly cited 30-plants-a-week reference point.
Why breadth beats any single food#
Two plates can hit the same calories and still deliver very different things. Different colors and species carry different nutrients — the pigments in a red pepper aren’t the ones in kale, and a grain isn’t a nut — so when the same handful of ingredients repeats day after day, the gaps repeat too. Mainstream guidance keeps coming back to the same simple shape: plenty of fruit and vegetables, a wide base of plants, fish in the mix, and heavier meats kept in proportion (World 2020). The framing here is additive, not restrictive — the question is rarely what to remove, but what one new thing you could add.
The strength of variety is that it’s forgiving. You don’t have to engineer a perfect day; you just have to avoid eating the same narrow set on repeat for weeks. Calk counts the distinct things you log, from ingredient variety across all your meals to the number of plant species — vegetables, fruits, grains, nuts, seeds, even herbs and spices — that appear over a week.
Breadth isn’t only a tally, though. A single nutrient-dense food — an oily fish, a handful of seeds — genuinely covers more of its group than a pile of near-identical leaves, and still no one food covers a group on its own. The diversity measures researchers have settled on work this way too: they weigh how evenly a varied plate is spread alongside how nutrient-rich its foods are, rewarding real range over either a long list of thin foods or a lone standout (Drescher 2007, Verger 2021). Calk reads your variety in the same spirit — crediting range and richness together, never one at the expense of the other.
Ingredient variety#
What Calk looks at. Calk counts the unique ingredients that show up across your meals each week. A narrow rotation tends to leave the same nutritional gaps open week after week, while a broad one covers more bases without any single food having to be remarkable — dietary diversity tracks with better micronutrient adequacy across populations, which is why some national guidelines frame the goal as a number of different foods rather than a list of “good” ones (World 2020).
What you could try. Add one new ingredient a week — that’s the whole move. Rotating vegetables by color (green, orange, red, purple) is a simple way to widen both variety and nutrient coverage without changing how you cook.
Produce pattern#
What Calk looks at. Calk watches whether fruit and vegetables are a steady part of the week or only turn up sporadically. Consistency matters more than the occasional large salad: the WHO target is at least 400 g a day (World 2020), and a dose-response meta-analysis of nearly a hundred prospective studies found higher intake associated with steadily lower risk up to about five daily servings, where the curve flattens out (Aune 2017).
What you could try. Build produce into the meals you already eat by default — berries with breakfast, a salad or vegetable soup at lunch, a vegetable side at dinner — rather than treating it as a separate effort. When fresh isn’t convenient, frozen is nutritionally on par.
Plant diversity#
What Calk looks at. Beyond raw produce, Calk counts the distinct plant species in your week — vegetables, fruits, grains, nuts, seeds, herbs, spices. The American Gut Project found that people eating 30 or more different plants a week carried noticeably more diverse gut microbiomes than those eating fewer than 10, and that held whether or not they called themselves vegetarian (McDonald 2018).
What you could try. Herbs and spices each count, so seasoning generously is an easy way to climb the number. Mixed salads, stir-fries with several vegetables, and a trail mix of assorted nuts and seeds get you toward 30 a week without much planning.
Fish frequency#
What Calk looks at. Calk checks how often fish or seafood appears across the week. Two servings a week — especially of fatty fish — is the level most guidance settles on, and it’s roughly what supplies the 250–500 mg of EPA+DHA omega-3 a day that heart-health guidance is built around (Rimm 2018).
What you could try. If fish is rare, start with one serving a week and build from there. Canned sardines, mackerel, and salmon are inexpensive and keep in the cupboard; if you’d rather not eat fish, shrimp and other shellfish still bring much of the same value.
Red meat pattern#
What Calk looks at. Calk keeps an eye on how often red and processed meat shows up. There’s real nutrition in a fresh cut — iron, B12, zinc — so this is about proportion, not avoidance; the World Cancer Research Fund suggests keeping red meat to about three portions a week (350–500 g cooked) and treating processed meat (bacon, sausage, deli slices) as the thing to limit first (World 2018).
What you could try. If red meat is showing up most days, swapping two or three meals a week toward poultry, fish, or a plant protein shifts the balance without anything dramatic. Trimming processed meat tends to do the most for the least effort, since fresh cuts sit easier in the overall pattern.