Healthy carbohydrates include rice, oats, vegetables, fruits and potatoes.
These types of foods can make up anything from 45 percent of a diet plan.
Tucking into meals high in healthy fats is also important, Steven continued.
Slimmers should aim for their diet to be 20 to 35 percent healthy fats, he suggested.
The expert added: “Healthy fats can cushion organs, regulate hormones, digest certain nutrients, and support the overall health of the brain and heart.