diff --git a/src/lib/components/BlockGameState.svelte b/src/lib/components/BlockGameState.svelte
index 3acf3e6..9575bf8 100644
--- a/src/lib/components/BlockGameState.svelte
+++ b/src/lib/components/BlockGameState.svelte
@@ -25,10 +25,10 @@
             <div class="flex align-center">
               {#if suffix === "%"}
                 <span class="label sign">{value >= 0 ? "+" : "-"}</span>
-                <span>{(100 * Math.abs(value)).toFixed(0)}</span>
+                <Number value={100 * Math.abs(value)} />
                 <span class="label suffix text-secondary-2">{suffix}</span>
               {:else}
-                <span>{value}</span>
+                <Number {value} />
                 <span class="label suffix text-secondary-2">{suffix}</span>
               {/if}
             </div>
diff --git a/src/lib/components/Farm.svelte b/src/lib/components/Farm.svelte
index 5080d24..caf05fe 100644
--- a/src/lib/components/Farm.svelte
+++ b/src/lib/components/Farm.svelte
@@ -34,10 +34,28 @@
             class="land-cell"
             class:tall={x == 4}
             data-tooltip={food.name}
+            class:is-only={$farm.getCropCount(food.id) === 1}
             class:unswappable={$userState.itemSelectedForSwap && !isSwappable(food)}
             class:swappable={$userState.itemSelectedForSwap && isSwappable(food)}
-            on:click={(e) =>
-              $userState.itemSelectedForSwap && isSwappable(food) && swapFoodItem(e, x, y)}
+            on:click={(e) => {
+              const isOnly = $farm.getCropCount(food.id) === 1
+              if (isOnly) {
+                // show toast popup here
+                console.log(
+                  `You must keep at least one ${food.name.replace(
+                    /s$/,
+                    ""
+                  )} square on the board at all times.`
+                )
+              }
+
+              return (
+                $userState.itemSelectedForSwap &&
+                !isOnly &&
+                isSwappable(food) &&
+                swapFoodItem(e, x, y)
+              )
+            }}
           >
             <div class="food-item-avatar bg-{food.colorId}" />
           </button>
diff --git a/src/lib/components/FoodStatsGrid.svelte b/src/lib/components/FoodStatsGrid.svelte
index 71ad262..a432a50 100644
--- a/src/lib/components/FoodStatsGrid.svelte
+++ b/src/lib/components/FoodStatsGrid.svelte
@@ -9,6 +9,16 @@
   import Button from "$lib/components/Button.svelte"
   import { largeNumber } from "$lib/utils/written"
 
+  type Key = "hectare" | "kilogram"
+  type Measure = { key: Key; label: string }
+  type KeyMetricGetter = { value: (f: Food) => string | number; sort: (a: Food, b: Food) => number }
+  type SortableData = { label: string; hectare: KeyMetricGetter; kilogram: KeyMetricGetter }
+
+  const measures: Measure[] = [
+    { key: "hectare", label: "per hectare land" },
+    { key: "kilogram", label: "per kilogram food" }
+  ]
+
   const impactPerHectare = (food: Food, xPerKg: number) =>
     xPerKg * food.yieldPerHa * $gameState.coefficients.yieldMultiplier
 
@@ -19,54 +29,114 @@
     $gameState.coefficients.yieldMultiplier *
     $gameState.coefficients.lossRatio
 
-  const columns = [
-    { label: "Name", sort: (a: Food, b: Food) => a.name.localeCompare(b.name) },
+  const data: SortableData[] = [
+    {
+      label: "Name",
+      hectare: {
+        value: (f: Food) => f.name,
+        sort: (a: Food, b: Food) => a.name.localeCompare(b.name)
+      },
+      kilogram: {
+        value: (f: Food) => f.name,
+        sort: (a: Food, b: Food) => a.name.localeCompare(b.name)
+      }
+    },
     {
       label: "Calories",
-      sort: (a: Food, b: Food) =>
-        nutritionPerHectare(b, b.calorieRatio) - nutritionPerHectare(a, a.calorieRatio)
+      hectare: {
+        value: (f: Food) => largeNumber(nutritionPerHectare(f, f.calorieRatio)),
+        sort: (a: Food, b: Food) =>
+          nutritionPerHectare(b, b.calorieRatio) - nutritionPerHectare(a, a.calorieRatio)
+      },
+      kilogram: {
+        value: (f: Food) => f.calorieRatio.toFixed(0),
+        sort: (a: Food, b: Food) => b.calorieRatio - a.calorieRatio
+      }
     },
     {
       label: "Protein",
-      sort: (a: Food, b: Food) =>
-        nutritionPerHectare(b, b.proteinRatio, $gameState.coefficients.proteinMultiplier) -
-        nutritionPerHectare(a, a.proteinRatio, $gameState.coefficients.proteinMultiplier)
+      hectare: {
+        value: (f: Food) =>
+          largeNumber(
+            nutritionPerHectare(f, f.proteinRatio, $gameState.coefficients.proteinMultiplier)
+          ),
+        sort: (a: Food, b: Food) =>
+          nutritionPerHectare(b, b.proteinRatio, $gameState.coefficients.proteinMultiplier) -
+          nutritionPerHectare(a, a.proteinRatio, $gameState.coefficients.proteinMultiplier)
+      },
+      kilogram: {
+        value: (f: Food) => f.proteinRatio.toFixed(0),
+        sort: (a: Food, b: Food) => b.proteinRatio - a.proteinRatio
+      }
     },
     {
       label: "Emissions",
-      sort: (a: Food, b: Food) => impactPerHectare(b, b.ghgPerKg) - impactPerHectare(a, a.ghgPerKg)
+      hectare: {
+        value: (f: Food) => largeNumber(impactPerHectare(f, f.ghgPerKg)),
+        sort: (a: Food, b: Food) =>
+          impactPerHectare(b, b.ghgPerKg) - impactPerHectare(a, a.ghgPerKg)
+      },
+      kilogram: {
+        value: (f: Food) => f.ghgPerKg.toFixed(1),
+        sort: (a: Food, b: Food) => b.ghgPerKg - a.ghgPerKg
+      }
     },
     {
       label: "Water",
-      sort: (a: Food, b: Food) =>
-        impactPerHectare(b, b.waterPerKg) - impactPerHectare(a, a.waterPerKg)
+      hectare: {
+        value: (f: Food) => largeNumber(impactPerHectare(f, f.waterPerKg)),
+        sort: (a: Food, b: Food) =>
+          impactPerHectare(b, b.waterPerKg) - impactPerHectare(a, a.waterPerKg)
+      },
+      kilogram: {
+        value: (f: Food) => f.waterPerKg.toFixed(0),
+        sort: (a: Food, b: Food) => b.waterPerKg - a.waterPerKg
+      }
     }
   ]
 
-  let sortFunction = columns[1].sort
+  let currentMeasure: Measure = measures[0]
+  let sortFunction = data[1][currentMeasure.key].sort
 
   $: foods = foodItems.sort(sortFunction)
 </script>
 
 <div class="food-items-grid block">
   <h3 class="block-title flex align-center">
-    Food output per hectare
+    Food output data
     <sup class="label" data-tooltip-title="Sources" data-tooltip="Our World in Data; USDA.">ⓘ</sup>
   </h3>
+  <div class="measure-buttons label-caps flex align-center">
+    {#each measures as { key, label }}
+      <Button
+        active={currentMeasure.key === key}
+        onClick={() => {
+          const sortedIndex = data.findIndex((o) => o[currentMeasure.key].sort === sortFunction)
+
+          currentMeasure = measures.find((m) => m.key === key) ?? measures[0]
+
+          sortFunction = data[sortedIndex][currentMeasure.key].sort
+        }}
+        classList="label-caps"
+      >
+        {label}
+      </Button>
+    {/each}
+  </div>
   <div class="food-items-grid-body">
     <div class="food-card table-head">
-      {#each columns as { label, sort }, i}
+      {#each data as column, i}
         <div class="th">
           <Button
             classList="bare bold"
             color="secondary"
-            active={sortFunction === sort}
+            active={sortFunction === column[currentMeasure.key].sort}
             onClick={() => {
-              if (sortFunction === sort) foods = foods.reverse()
-              else sortFunction = sort
+              if (sortFunction === column[currentMeasure.key].sort) foods = foods.reverse()
+              else sortFunction = column[currentMeasure.key].sort
             }}
           >
-            {label}
+            {column.label}
           </Button>
         </div>
       {/each}
@@ -80,14 +150,11 @@
       >
         <div class="food-item-avatar flex-center bg-{f.colorId}" />
         <strong class="name">{f.name}</strong>
-        <div class="td">{largeNumber(nutritionPerHectare(f, f.calorieRatio))}</div>
-        <div class="td">
-          {largeNumber(
-            nutritionPerHectare(f, f.proteinRatio, $gameState.coefficients.proteinMultiplier)
-          )}
-        </div>
-        <div class="td">{largeNumber(impactPerHectare(f, f.ghgPerKg))}</div>
-        <div class="td">{largeNumber(impactPerHectare(f, f.waterPerKg))}</div>
+        {#each data.slice(1) as column}
+          <div class="td">
+            {column[currentMeasure.key].value(f)}
+          </div>
+        {/each}
       </div>
     {/each}
   </div>
@@ -98,6 +165,10 @@
   sup
     margin-left: 0.5em
 
+.measure-buttons
+  gap: 0.25rem
+  margin: 0.25rem 0 0
+
 .food-items-grid
   gap: 0.25rem
 
diff --git a/src/lib/data/toasts/guide.ts b/src/lib/data/toasts/guide.ts
index 5d45d0d..f15387f 100644
--- a/src/lib/data/toasts/guide.ts
+++ b/src/lib/data/toasts/guide.ts
@@ -26,7 +26,7 @@ export const guide = [
     img: "guide.png",
     title: "Your food inventory",
     message:
-      "These are the foods available to you. You will close the food gap by replacing the squares on your global farm with these food items.",
+      "These are the foods available to you. Close the food gap by swapping these with the foods on your global farm. To maintain nutritional and market balance, you only have <b class='food-item-avatar bg-animal-1'>3</b> of each item to use. You must keep at least <b class='food-item-avatar bg-animal-1'>1</b> of each item on the farm at all times.",
     button: "Next",
     target: "#food-menu-wrapper",
     next: 2,
diff --git a/src/lib/stores/models/Farm.ts b/src/lib/stores/models/Farm.ts
index 6f1abc3..50e929e 100644
--- a/src/lib/stores/models/Farm.ts
+++ b/src/lib/stores/models/Farm.ts
@@ -109,16 +109,20 @@ export class Farm {
     )
   }
 
-  getFarmMetric(fn: (item: Food) => number, unit: Unit): FarmMetric {
-    const total = this.getTotalSum(fn)
-    const byFood = this.getSumByFoodType(fn, unit)
-    return { total, byFood }
+  getCropCount(id: FoodId) {
+    return this.grid.flat().filter((o) => o?.id === id).length
   }
 
   plantCrop(x: number, y: number, foodItem: Food) {
     this.grid[y][x] = JSON.parse(JSON.stringify(foodItem))
   }
 
+  getFarmMetric(fn: (item: Food) => number, unit: Unit): FarmMetric {
+    const total = this.getTotalSum(fn)
+    const byFood = this.getSumByFoodType(fn, unit)
+    return { total, byFood }
+  }
+
   getTotalSum(fn: (item: Food) => number): number {
     return +this.grid
       .flat()
diff --git a/src/lib/stores/state.ts b/src/lib/stores/state.ts
index 9ac6141..b8625c8 100644
--- a/src/lib/stores/state.ts
+++ b/src/lib/stores/state.ts
@@ -64,7 +64,7 @@ export const successMetrics = derived(
         value: proteinPerPersonPerDay,
         label: "Protein per capita",
         suffix: "g",
-        objective: `Keep above ${$gameState.nutritionalRequirements.protein}`,
+        objective: `Keep above ${$gameState.nutritionalRequirements.protein}g`,
         warn: proteinPerPersonPerDay < $gameState.nutritionalRequirements.protein + 5
       },
       emissionsChange: {
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 3489962..68fd6ee 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -60,10 +60,10 @@
   </div>
   <FoodInformationCard />
   <Tooltip />
-  <WelcomeScreen />
-  <EndScreen />
+  <!-- <WelcomeScreen /> -->
+  <!-- <EndScreen /> -->
   <AboutScreen />
-  <Toast />
+  <!-- <Toast /> -->
 </main>
 
 <style lang="sass">
diff --git a/src/styles/components/food-item.sass b/src/styles/components/food-item.sass
index dd69122..d720a97 100644
--- a/src/styles/components/food-item.sass
+++ b/src/styles/components/food-item.sass
@@ -1,7 +1,7 @@
 .food-item-avatar
   width: 1em
   height: 1em
-  display: flex
+  display: inline flex
   flex-shrink: 0
   border-radius: 100%
   align-items: center