This case study presents the nutritional and lifestyle management of Parishmita, a 28-year-old female weight-66 kg, height- 163 cm diagnosed with hypothyroidism and PCOS, accompanied by anxiety-related symptoms. She presented with multiple interlinked concerns including mood swings, delayed menstrual cycles, weight gain, digestive disturbances (constipation and occasional acidity), and gut health imbalance. Contributing lifestyle factors included regular alcohol consumption, smoking, irregular meal timing, poor sleep quality, and inconsistent physical activity despite attending the gym. Given the close metabolic and hormonal overlap between hypothyroidism, PCOS, and chronic stress, a personalised, phase-wise nutrition and lifestyle intervention was planned. The approach focused on thyroid and insulin sensitivity support, gut healing, cortisol regulation, and menstrual cycle regularity, rather than calorie restriction. Emphasis was placed on balanced macronutrient intake, adequate protein, fibre-rich foods, micronutrient repletion, and anti-inflammatory dietary patterns, alongside lifestyle counselling for stress management, sleep hygiene, and reduction of alcohol and smoking.