Fish and fish eggs are great. Salmon, herring, sable, trout and sardines are great- just not salted. Red meat in moderation (once a week) is fine- women, especially, need the iron. Watch out for salty meats (e.g., corned beef, pastrami, etc.), usually doused in nitrates and nitrites that promote pancreatic cancer, in particular. Same goes for most lunch meats.
Keep your carbohydrates to a minimum, except for fruits and vegetables, which, as Chaim states, are very beneficial. Bread, rice, and noodles are bad. When you eat these in combination with cholesterol/saturated fats you burn the carbs and store the fats- bad. When your carbohydrate reserves are low you burn fats- much more efficient and healthy. Sugar is the enemy.
Eat organic if you can. The chemicals (e.g., hormones, antibiotics, preservatives, etc.) in most conventional food are very damaging to your immunity and cellular metabolism. Probiotics- good.
Drink water- period. A cup of organic coffee a day perhaps, a glass of wine here and there perhaps, is good. BTW- I witnessed and participated in many hospital autopsies and noted that alcoholics' blood vessels were as smooth as a baby's; however, their livers were a mess. Fruit juices, widely touted as healthy, simply have too much sugar- avoid it. BTW- NYC has some of the best water available- from the mountains of upstate NY. We tested it in the clinical labs at The Mount Sinai Hospital (c. 1992), and it was clean as a whistle.
Exercise is vital- an intense 30 minute "cardio" type workout 4-5x/week is great. Meditation- ooooh- has been shown to be beneficial. Studies have shown an association with lower blood pressure and cortisol (stress hormone) levels.
Some of you may be able to keep a strict regimen, others may not, but at least have something to strive for.
On the humorous side, when asked the secret to his longevity, George Burns replied "Eat half."