Simplest nutrition
This is as simple as it gets:
If you want not only to survive but thrive, you canβt neglect what and how much you are eating.
Eat your vegetables & fruits, and set a protein target.
General guidelines about how much energy you need and where that energy comes from, require some testing to see how they apply to you.
Not being sick or dying is a completely different thing than performing at your best. If you want to perform, feel or look a certain way, the food you eat will play a crucial role in that.
Eat your fruits and vegetables. An adult's recommended daily dose to survive is roughly 500 grams, but upwards of those five servings is better. The beautifully elegant advice from EC Synkowski is to aim for 800 grams per day and do periods of weighing this to fine-tune your eyeballing and guesstimates of this quantity.
Couple this with a target for how much protein you eat, depending on your body composition goals. The ballpark of a little over 2 grams of protein per kilogram of body weight (or 1 gram of protein per Lbs of body weight) is a great starting point for your personal fine-tuning. Once again, some initial and periodic measuring is required to gain an understanding of portions.
The amount and ratio of the three macronutrients of carbohydrates, protein, and fat determine the amount of energy you consume and primarily determine how you will look. However, micronutrients like vitamins and minerals are the actual game behind how you feel and perform.
The big takeaway here (pun intended):
Simple, not easy.