diff --git a/database/seeders/DemoContentSeeder.php b/database/seeders/DemoContentSeeder.php
index e62b65b..fb93679 100644
--- a/database/seeders/DemoContentSeeder.php
+++ b/database/seeders/DemoContentSeeder.php
@@ -7,14 +7,14 @@ use App\Enums\FollowStatus;
 use App\Enums\IngredientUnit;
 use App\Enums\MealPostType;
 use App\Enums\MealPostVisibility;
+use App\Enums\NutritionPlanSource;
 use App\Enums\PacePreference;
 use App\Enums\PhysicalActivityLevel;
+use App\Enums\UserRole;
 use App\Enums\UserSex;
 use App\Enums\WeightGoal;
 use App\Enums\WorkoutSource;
 use App\Models\User;
-use App\Models\WeightEntry;
-use App\Models\WorkoutSessions;
 use Illuminate\Database\Console\Seeds\WithoutModelEvents;
 use Illuminate\Database\Seeder;
 use Illuminate\Support\Collection;
@@ -112,19 +112,90 @@ class DemoContentSeeder extends Seeder
                 'bio' => 'Des repas adaptés aux longues sorties et à la récupération.',
             ],
         ])->map(
-            fn (array $profile): User => User::factory()->create($profile)
+            fn (array $profile): User => $this->createUser($profile)
         );
 
-        User::factory()->withoutNutritionOnboarding()->create([
+        $this->createUser([
             'name' => 'Nouveau profil',
             'email' => 'onboarding@example.com',
             'locale' => 'fr',
             'terms_accepted_at' => now(),
-        ]);
+        ], withNutritionOnboarding: false);
 
         return $users;
     }
 
+    /**
+     * @param  array<string, mixed>  $profile
+     */
+    private function createUser(array $profile, bool $withNutritionOnboarding = true): User
+    {
+        $onboardingAttributes = $withNutritionOnboarding
+            ? [
+                'height' => 175,
+                'target_weight' => 70,
+                'date_of_birth' => '1990-01-01',
+                'sex' => UserSex::MAN,
+                'physical_activity_level' => PhysicalActivityLevel::MODERATELY_ACTIVE,
+                'weight_goal' => WeightGoal::MAINTAIN_WEIGHT,
+                'pace_preference' => PacePreference::NORMAL,
+                'onboarding_completed_at' => now(),
+                'nutrition_estimate_accepted_at' => now(),
+            ]
+            : [
+                'height' => null,
+                'target_weight' => null,
+                'date_of_birth' => null,
+                'sex' => null,
+                'physical_activity_level' => null,
+                'weight_goal' => null,
+                'pace_preference' => null,
+                'onboarding_completed_at' => null,
+                'nutrition_estimate_accepted_at' => null,
+            ];
+
+        $user = User::query()->create([
+            'locale' => 'en',
+            'role' => UserRole::USER,
+            'email_verified_at' => now(),
+            'password' => 'password',
+            'avatar_url' => null,
+            ...$onboardingAttributes,
+            ...$profile,
+        ]);
+
+        if ($withNutritionOnboarding) {
+            $this->createNutritionOnboarding($user);
+        }
+
+        return $user;
+    }
+
+    private function createNutritionOnboarding(User $user): void
+    {
+        $user->weightEntries()->create([
+            'weight_kg' => 70,
+            'measured_at' => now(),
+        ]);
+
+        $user->nutritionPlans()->create([
+            'source' => NutritionPlanSource::ONBOARDING,
+            'formula_version' => 'mifflin_st_jeor_v1',
+            'calories' => 2200,
+            'proteins' => 112,
+            'carbs' => 286,
+            'fats' => 61,
+            'resting_metabolism' => 1650,
+            'maintenance_calories' => 2200,
+            'calorie_adjustment_percent' => 0,
+            'calculation_details' => [
+                'activityFactor' => 1.55,
+                'inputWeightKg' => 70,
+            ],
+            'effective_from' => now(),
+        ]);
+    }
+
     /**
      * @param  Collection<int, User>  $users
      */
@@ -239,7 +310,7 @@ class DemoContentSeeder extends Seeder
         $demoUser->weightEntries()->delete();
 
         foreach (range(11, 0) as $weeksAgo) {
-            WeightEntry::factory()->for($demoUser)->create([
+            $demoUser->weightEntries()->create([
                 'weight_kg' => round(74.8 - ((11 - $weeksAgo) * 0.28), 2),
                 'measured_at' => now()->startOfDay()->subWeeks($weeksAgo),
             ]);
@@ -275,7 +346,7 @@ class DemoContentSeeder extends Seeder
                 throw new LogicException('Unable to build the demo workout collection.');
             }
 
-            WorkoutSessions::factory()->for($demoUser)->create([
+            $demoUser->workouts()->create([
                 'external_id' => $source === WorkoutSource::STRAVA ? "demo-strava-{$index}" : null,
                 'source' => $source,
                 'type' => $workout['type'],
diff --git a/tests/Feature/DemoContentSeederTest.php b/tests/Feature/DemoContentSeederTest.php
index f320555..1a7eebb 100644
--- a/tests/Feature/DemoContentSeederTest.php
+++ b/tests/Feature/DemoContentSeederTest.php
@@ -20,6 +20,9 @@ it('creates a complete local demonstration dataset', function () {
     expect(User::query()->count())->toBe(10)
         ->and($demoUser->hasCompletedNutritionOnboarding())->toBeTrue()
         ->and($onboardingUser->hasCompletedNutritionOnboarding())->toBeFalse()
+        ->and(User::query()->whereNotNull('onboarding_completed_at')->count())->toBe(9)
+        ->and($demoUser->nutritionPlans()->count())->toBe(1)
+        ->and($onboardingUser->nutritionPlans()->count())->toBe(0)
         ->and($demoUser->weightEntries()->count())->toBe(12)
         ->and($demoUser->workouts()->count())->toBe(12)
         ->and($demoUser->following()->count())->toBe(8)