This refers to both the type of food we consume and eating smaller, healthier portions. The food we consume should be nourishing, adequate and fresh so we get a balanced diet as our bodies reflect what we eat. For some people “their god is their stomach” (Phil 3:19). Gluttony, leading to being overweight, is both a sin and an unhealthy lifestyle, as is being too slim (Prov 23:20,21). Being overweight causes many heath issues besides impeding the overall efficiency of the person’s life. It's basically through the food we eat and our lifestyle we become ill and its through the same two factors we can become well.
Dieting and the limiting of certain food types are valid and wise measures along with physical exercise to keep the body in shape. Some people suffer from food allergies and so obviously these foods should be avoided.
How are my eating habits?
As caretakers it is our responsibility to respect and care for our bodies for they are the temple of Holy Spirit (1 Cor 6:19). We are what we physically eat and feed into our minds so self-control needs to be exercised in both. Daniel and his associates chose to eat healthier food and drink, and were all the better for it (Dan 1:8-16).