The nutritionist is a healthcare professional qualified to provide dietary care and ensure food security by studying nutritional needs to maintain and restore health. A healthy diet involves eating a balanced variety of foods like vegetables and fruits to maintain ideal weight and good health. Some tips for healthy eating include eating 5-6 small meals per day with no more than 4 hours between meals, limiting eggs and red meat, and choosing whole grains and plant-based foods while avoiding processed foods and sugary drinks. Good nutrition ensures survival, provides energy, and helps prevent disease and support growth and development.