Your body cannot produce micronutrients—vitamins and minerals—which is why you need to get them from food. Whole foods are the best sources of micronutrients. On the other hand, food processing leads to the loss of certain nutrients which are highly sensitive, such as ascorbic acid, folic acid, and thiamin. 
Highly processed foods contain harmful ingredients like added sugars and trans fats. Consuming them repeatedly can negatively affect your skin health in different ways.
For example, added sugars break down collagen, making your skin vulnerable to aging.  A study also shows that consuming trans fatty acids increases your risk of ultraviolet radiation (UVR) skin damage. 
Eating a clean diet can promote younger-looking and healthy skin, among other strategies like sleep and stress management.
One of the best things you can do to promote gut health is to reduce the processed foods you eat. A clean keto diet helps your gut by providing fiber, which can:
- Help with digestion, especially in people who are having constipation at the start of their keto diet. (In contrast, processed foods don’t just contain more sugars, but they usually lack fiber.)
- Increase the diversity and richness of your microbiome—the microorganisms in your gut.  Eating a wide range of foods, which happens on a clean keto diet, will boost your microbiome.
In addition to fiber, a clean keto diet provides prebiotics from foods like asparagus, artichokes, garlic, and onions. Prebiotics promote the growth of beneficial gut bacteria and lower the population of harmful gut bacteria. 
Break Through a Weight Loss Stall
If you’ve been on the keto diet for months now, and you’re experiencing a weight loss plateau, check your food choices. You might be consuming more calories, sugar, and carbs as a result of eating more processed foods.
Plus, it’s easy to overindulge in these foods since they taste more appealing. This is especially true if you’re not tracking your macronutrients and calories.
Speaking of calories, whole foods are naturally lower in calories, which helps with weight loss. (Although keep in mind that not all calories are equal and that you should be getting your calories from quality sources.)