"Ne mangez rien que votre arrière-grand-mère ne reconnaîtrait pas comme de la nourriture."

Simplified Meaning:

Imagine going to the grocery store with your great-grandmother. A lot of the packaged and processed foods you see today did not exist in her time. She would probably be confused by things like neon-colored snacks, sugary cereals, or frozen dinners with lots of ingredients she’s never heard of. The advice is to eat simple, natural foods like fruits, vegetables, whole grains, and meats, similar to what people ate in the past. These foods are usually healthier because they don’t contain lots of artificial additives, preservatives, or chemicals. For example, instead of eating a snack cake with a long list of ingredients, you could choose an apple or a handful of nuts. By following this advice, you can improve your diet and overall health. Eating foods that are closer to their natural state can give your body the nutrients it needs without added unhealthy substances. So, when you're shopping or planning meals, think about what your great-grandmother would recognize as food and choose those options.