To have more physical and mental health, more energy, more concentration and, obviously, more health and still lose a few extra pounds, there is nothing more effective than a healthy, balanced and varied diet.
Let's start with quinoa, a millenary cereal that is gaining more and more prominence these days. This food, which is actually a pseudo-cereal, is assumed to be super rich in protein, amino acids and even nutrients identical to those found in swiss chard  and spinach. Being rich in fiber and having low levels of carbohydrates, quinoa is one of the best options for those who want to lose a few extra pounds, but it does not dispense a comforting and satiating meal.
Chia seeds, cheap and easy to find on large surfaces, are another superfood to take into account, especially if the goal is to improve the body's function. These small black seeds (which must be hydrated before consuming) are rich in omega-3s, contain good levels of protein, calcium, iron, potassium and B-complex vitamins.

Continuing in the seeds, flaxseed, one of the best sources of essential fatty acids (3 and 6) and fundamental properties for the smooth operation of intestinal transit and cardiovascular health.
For some known as cabbage leaves, for others as kale, this vegetable is one of the foods with higher vitamin content (A, C and K) and still holds good levels of calcium, iron, zinc and potassium. If the goal is to eat well and lose a few pounds, kale is always a good bet, other than this highly nutritious and low calorie vegetable (only 33 per cup).
Also in the range of 'greens', broccoli should also be a regular bet on food, as they have important properties that prevent and combat cancer, which are still rich in vitamin A, C and E and minerals such as zinc and potassium.
Finally, but no less super, is dark chocolate, a food that has good doses of antioxidants important for the body and the immune system, however, and unlike, for example, kale and broccoli, dark chocolate (with a cocoa content always higher than 70%) should be consumed in moderation as it is caloric.