In a nutshell, if you want to supercharge your basic garden variety whole foods, plant based diet you add more: – greens, spices,  nuts,   seeds and  berries.
If you look at that list, you could just say, continue to eat a truckload of vegetables and fruits, but surprise, surprise, not all veggies and fruits were created equal!   Cucumber and iceberg lettuce do have some fibre, phytonutrients(good chemicals  from plants) and  anti-oxidants but they tail the field and are a long way away from the those foods listed above. In general, it is a good idea to eat the biggest variety of fruits and vegetable that you can get into your mouth.  This is becuase if we do this we are maximising the nutrients and the power of plants to heal our body, as different plants have different chemical balances  and different parts of plants have different chemical balances.  Sometimes eating different plants together makes these chemicals more available to our body, like in the case of pepper and turmeric.  Eating pepper with turmeric makes curcumin the helpful chemical to us in turmeric 2000x more available for us to use.  This is good as turmeric fights inflammation(chronic low level inflammation is at the root of  disease in our body) and it has anti-cancer properties(specifically turning back on the cell death process in cancer cells). I am just going to give you a ‘taste’ of the benefits of these particular foods.  If you want more information check out nutrition facts website in the sidebar.
SPICES
Spices are high in anti-oxidants and have many other useful properties as well.  For example, cinnamon lowers your blood sugar levels, but really the best way to keep blood sugar levels low is maintain a healthy weight.  This is because insulin can’t move the sugar from our bloodstream to the cells, as the cells already are too full of fat, if you are overweight.  If you are going to go out of your way to eat extra cinnamon, say a teaspoon a day  on your porridge then  make sure it is cinnamon from Sri Lanka(other cinnamons are often Sennas and are damaging to the liver in high quantities.)
NUTS
Nuts are a good source of fats in the diet and eaten in small quantities with your meal(small handful) increase the availability of nutrients from vegetables, as they aid digestion. Â They can also be a good source of minerals, for example Brazil nuts for selenium. Â We have three Brazil nuts for breakfast, taken like medicine. Â Better than having to take 10-12 pills each morning. Â I think the European average for a 60 year old, my age is 9 tablets/day.
SEEDS
Seeds are very good for mood, in fact eating vegetarian or vegan is associated with better mood than being an omnivore.  An amino acid, trytophan, which is high in concentration in some seeds, is a precursor to serotonin production.  The  appropriate level of serotonin in the brain is associated with good mood. One particular seed is especially good for you-flax seed.  Flaxseed is a good source of short chain fatty acids from which our body is able to make  long chain fatty acids.  The beauty of eating flax seeds is they are, like all plants, high in fibre and in the case of flax, have the precursor for the production of lignans in our gut, as the good bacteria in our gut digest it.  Lignans are known to combat breast cancer.  Getting long chain fatty acids for  your brain is much better by the flaxseed route than the fish route.  Flax has  no cholesterol, no excess protein, but most importantly not the high levels of mercury and PCB’s(carcinogenic plastics) found in fish.  If you are going to use flaxseed grind it yourself as you use it as pre-ground it deteriorates and without grinding, it just goes straight out the other end without digesting.
BERRIES
Berries are high in anti-oxidants and  have been found to have many other helpful functions as well, from anti-cancer and anti-inflammation to reducing muscle soreness after exercise(if you eat the berries prior to the exercise).  We have just added them to our diet, by adding them to our morning porride(frozen blueberries or fresh strawberries).  Berries, beans and greens may be the best things for us to eat on the planet! BREAKFAST PORRIDGE We eat a lot of porridge!  Rolled Oats and water(well actually, unstabilised organic oats and water) with lots of other stuff chucked in the bowl.  We add: – ground flaxseed(we don’t have a grinder at the moment so we are adding wheatgerm instead) – cacao nibs -blueberries – banana – sultanas – cinnamon -sunflower seeds -pepitas (pumpkin seeds)
Tastes great, lowers cholesterol from all of the fibre, shoots up anti-oxidants levels to counter DNA damage caused by free radicals which are created just by sitting around breathing, let alone doing anything, has  short chain and therefore long chain fatty acids for the old brain, seeds for mood and fat for digestion and slow release of energy from all of those complex carbs or starches.  What more could you want!! Lunch is rye bread and peanut paste, home made vegan cake and a couple of apples and dinner is some staple(pasta, beans, lentils, rice, potatoes) with a combination of veggies and herbs and spices.
A couple of other tips.  Broccoli  has great anti-cancer properties but it  needs to be cut up 20 -30 minutes before it is cooked to maximise this.  This is due to enzyme is able to do its work and assist chemical reaction to produce the anti-cancer substance.  Similar story for garlic: crush 10 minutes before use.
Enjoy food, enjoy life!