diff --git a/src/templates/index.html b/src/templates/index.html
index 51a988b..7db9f6f 100644
--- a/src/templates/index.html
+++ b/src/templates/index.html
@@ -281,7 +281,8 @@ function updateTotalNutrition() {
                 <datalist id="products">
                     <!-- Produkte werden hier dynamisch eingefügt -->
                 </datalist>
-                <input type="number" id="weight" name="weight" placeholder="Gramm" step="0.1" oninput="updateButtonState()">
+                <input type="number" id="weight" name="weight" placeholder="Gramm" step="0.1" min="0" oninput="updateButtonState()">
+
                 <button type="submit" id="submit-button" disabled>Hinzufügen</button>
             </div>
         </form>