diff --git a/src/update.ts b/src/update.ts
index 27a96ff..8f0ba6a 100644
--- a/src/update.ts
+++ b/src/update.ts
@@ -32,7 +32,7 @@ export default function update(timestamp: number) {
                 }
             }
 
-            // Make all buildings produce and consume.
+            // Make all buildings and units produce and consume.
             const productionPerMinute = getProduction(V);
             const storage = getStorage(V);
 
@@ -41,6 +41,11 @@ export default function update(timestamp: number) {
                 const outputPerMinute = productionPerMinute[resource];
                 const outputPerMilisecond = outputPerMinute /  60.0 / 1000.0;
                 V.resources[resource] += outputPerMilisecond * delta;
+            });
+
+            // Make sure resources do not overflow.
+            Object.keys(productionPerMinute).forEach((key) => {
+                const resource = key as keyof ProductionType;
 
                 if (V.resources[resource] > storage[resource]) {
                     V.resources[resource] = storage[resource];
diff --git a/src/utils.ts b/src/utils.ts
index 03ec5ae..2603802 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -24,14 +24,27 @@ export function getEmptyResources(): ProductionType {
 
 
 export function getProduction(villageState: VillageState): ProductionType {
-    return villageState.buildings
+    let production = getEmptyResources();
+
+    // Add buildings production and intake.
+    production = villageState.buildings
         .filter(b => b.behavior.production && b.level > 0)
         .map(b => {
             if (b.behavior.production) {
                 return b.behavior.production(villageState, b);
             }
         })
-        .reduce(_reduceResources, getEmptyResources());
+        .reduce(_reduceResources, production);
+
+    // Add units intake.
+    ['philosopher'].forEach(type => {
+        const unit = getUnitSource(type);
+        const unitCount = villageState.units[type] || 0;
+        const intakePerMinute = unit.behavior.foodIntakePerMinute * unitCount;
+        production.food -= intakePerMinute;
+    });
+
+    return production;
 }