Inclusion Criteria:
* 1\. Age and Consent Capacity
* Age ≥18 years (adults of either biological sex or gender identity)
* Able to understand study procedures and provide written informed consent independently or with assistance from legally authorized representative 2. Cancer Diagnosis
* Histologically or cytologically confirmed solid tumor malignancy of any type, including but not limited to:
* Lung cancer (non-small cell or small cell)
* Breast cancer
* Gastrointestinal cancers: gastric (stomach), colorectal, pancreatic, esophageal, hepatobiliary (liver, gallbladder, bile duct)
* Head and neck cancers (oral cavity, pharynx, larynx, nasal cavity, salivary glands)
* Gynecological cancers: cervical, ovarian, endometrial, vulvar, vaginal
* Genitourinary cancers: prostate, bladder, renal (kidney), testicular
* Other solid tumors: sarcomas, melanoma, thyroid, brain tumors
* Any cancer stage eligible (Stage I, II, III, or IV) 3. Cancer Cachexia
* Documented unintentional weight loss meeting at least one of the following criteria:
* Weight loss ≥3% of body weight within the past 3 months, OR
* Weight loss ≥5% of body weight within the past 6 months
* Weight loss must be documented by medical records, patient self-report, or measurement at screening visit compared to documented previous weight 4. Active Cancer Treatment
* Currently receiving active anti-cancer treatment, OR
* Scheduled to begin active anti-cancer treatment within 2 weeks of enrollment
* Eligible anti-cancer treatments include:
* Chemotherapy (cytotoxic agents, any regimen)
* Radiation therapy (external beam or brachytherapy)
* Targeted molecular therapy (tyrosine kinase inhibitors, monoclonal antibodies)
* Immunotherapy (checkpoint inhibitors, CAR-T cell therapy)
* Hormonal therapy for hormone-sensitive cancers
* Combination therapies
* Patients receiving palliative/supportive care only (without active anti-cancer treatment) are excluded 5. Performance Status
* Eastern Cooperative Oncology Group (ECOG) Performance Status 0, 1, or 2:
* Grade 0: Fully active; able to carry on all pre-disease activities without restriction
* Grade 1: Restricted in physically strenuous activity but ambulatory; able to carry out light or sedentary work (e.g., light housework, office work)
* Grade 2: Ambulatory and capable of all self-care activities but unable to carry out any work activities; up and about \>50% of waking hours 6. Technology Access and Literacy
* Access to a smartphone or tablet device with video calling capability (personal device or family member's device that participant can use)
* Reliable internet connectivity available via at least one of:
* Home Wi-Fi network
* Mobile cellular data plan (3G, 4G, or 5G)
* Access to public/community Wi-Fi
* For telemedicine group: willingness and ability to participate in video consultations 7. Language
* Able to communicate verbally in Urdu (national language of Pakistan) or English
* Able to understand spoken instructions and questions
* Literacy not required; illiterate participants eligible with assistance from family/witness for consent and questionnaires 8. Geography
* Able to attend in-person assessments at King Edward Medical University/Mayo Hospital, Lahore, Pakistan at baseline (Week 0) and Week 12
* For telemedicine group: only 2 hospital visits required (Weeks 0 and 12)
* For standard care group: able to attend 7 hospital visits (Weeks 0, 2, 4, 6, 8, 10, 12) 9. Commitment
* Willing to participate in the study for the full 12-week duration
* Willing to comply with study procedures including dietary assessments, questionnaires, blood tests, and nutritional counseling sessions
Exclusion Criteria:
* Inability to Eat Orally
* Severe dysphagia (difficulty swallowing) requiring enteral nutrition support via:
* Nasogastric tube feeding
* Percutaneous endoscopic gastrostomy (PEG) tube
* Jejunostomy tube
* Complete bowel obstruction preventing oral intake
* Total parenteral nutrition (TPN) as sole nutritional support
* Note: Partial oral intake supplemented with enteral nutrition is eligible if patient can consume at least some food by mouth 2. Refractory Cachexia
* ECOG Performance Status 3 or 4:
* Grade 3: Capable of only limited self-care; confined to bed or chair \>50% of waking hours
* Grade 4: Completely disabled; cannot carry out any self-care; totally confined to bed or chair
* Active cachexia management deemed not clinically appropriate or futile by treating oncologist
* Estimated life expectancy \<3 months per treating oncologist's assessment
* Imminent end-of-life care or transition to hospice care 3. Uncontrolled Comorbid Conditions
* Uncontrolled diabetes mellitus defined as:
* Glycated hemoglobin (HbA1c) \>9% within past 3 months, OR
* Frequent hypoglycemic or hyperglycemic episodes requiring emergency care
* Rationale: Uncontrolled diabetes affects nutritional metabolism and requires specialized dietary management beyond scope of this intervention
* End-stage renal disease requiring dialysis (hemodialysis or peritoneal dialysis)
o Rationale: Dialysis patients require specialized renal diet with protein, fluid, potassium, and phosphorus restrictions that differ substantially from cancer cachexia nutritional recommendations
* Severe heart failure, New York Heart Association (NYHA) Functional Class IV:
* Symptoms at rest; any physical activity causes discomfort
* Rationale: Severe cardiac cachexia has different pathophysiology and requires cardiology-directed nutritional management 4. Psychiatric or Cognitive Impairment
* Active psychiatric illness that would preclude meaningful participation or informed consent, including:
* Severe major depressive disorder with active suicidal ideation
* Acute psychotic episode (schizophrenia, bipolar disorder with psychosis)
* Severe anxiety disorder preventing participation in counseling sessions
* Cognitive impairment preventing informed consent or ability to participate, including:
* Advanced dementia (moderate to severe; unable to follow simple instructions)
* Severe delirium (acute confusional state)
* Significant brain metastases causing cognitive dysfunction
* Note: Mild cognitive impairment or controlled psychiatric conditions with stable treatment are not exclusionary 5. Concurrent Study Participation
* Currently enrolled in another interventional clinical trial testing nutritional interventions, dietary supplements, or appetite stimulants
* Rationale: Concurrent nutritional interventions would confound outcome assessment
* Note: Participation in observational studies, cancer treatment trials (chemotherapy, radiation), or non-nutritional supportive care trials is permitted 6. Pregnancy or Lactation
* Pregnant women (confirmed by urine or serum pregnancy test if reproductive potential)
* Breastfeeding/lactating women
* Rationale: Pregnancy and lactation have substantially different and increased nutritional requirements that require specialized prenatal/postnatal nutritional counseling beyond the scope of cancer cachexia management in this protocol 7. Severe Food Allergies or Intolerances
* Known severe allergy or intolerance to recommended nutritional supplements (oral nutrition supplements, protein powders, vitamins/minerals) for which no suitable alternatives are available in Pakistan
* Note: Common food allergies (dairy, eggs, nuts) are not exclusionary as alternative food sources can be recommended 8. Logistical Barriers
* Unable to attend baseline assessment visit (Week 0) at King Edward Medical University/Mayo Hospital, Lahore
* Unable to attend final assessment visit (Week 12) at the hospital
* For telemedicine group: Complete inability to access internet or use smartphone/tablet even with family assistance
* No reliable means of contact (no phone number, no address) 9. Other
* Enrolled in this study previously (re-enrollment not permitted)
* Non-cancer-related causes of weight loss that would confound cachexia assessment:
* Active eating disorder (anorexia nervosa, bulimia nervosa) requiring psychiatric treatment
* Intentional weight loss through dieting for weight management
* Hyperthyroidism causing unintentional weight loss (must be controlled before enrollment)
* Active gastrointestinal infection (parasites, chronic diarrhea from infectious cause)
* Any condition that, in the opinion of the principal investigator, would compromise patient safety, study integrity, or ability to complete study procedures