I'm 65 years old, 5'6" (approx) 10 stone in weight (plus or minus a pound or two) BMI 22/23, waist to hip ratio 0.74. I practice 5:2 fasting, walk my dog and take part in three 90 minute karate training sessions a week.
Things I don't consume: fizzy drinks (so called diet drinks are bad as well as the high sugar ones), fruit juices and squash, sugary cereals (Check the box. They all have masses of added sugar.), white bread.
Things I rarely eat: cakes, other baked goods (but never say never!)
Things I do eat: full fat natural Greek yogurt every day*(Fage Total and M&S Authentic Greek 10% fat are the scrummiest), walnuts *every day, beans and pulses, meat (though not every day), eggs, wholemeal bread (not every day), rice, pasta, vegetables, potatoes, fruit (but not every day), butter, crumpets, ready made pastry for an occasional pie... chocolate (not every day but I binge), unsweetened coffee and tea with milk.
I think portion size is important. 5:2 fasting naturally leads to portion control without counting calories on non-fasting days.