Personal quantum computers, and maybe virtual reality with artificial intelligence combined.

Addressing many common diseases such as cardiovascular disease, type 2 diabetes, arthritis, PCOS, depression, anxiety, and ADHD. All of these are metabolic diseases that were rare in human populations around the world just 50 years ago.

Contrary to what the US's department of agriculture says (that we should eat mostly plants via the Food Pyramid/MyPlate) starting in the late '70s, it turns out that the human species has evolved over >2 million years to hunt animals. Of the three macronutrients (carbohydrates, proteins, and fats), we should be getting most of our calories from fats via fatty meats.

The growing popularity and success of ketogenic diets (especially the carnivore diet) in reversing many metabolic diseases once thought to be incurable and attributed to age is a sign that humans have finally rediscovered our species-appropriate diet.