✅ Yes, the content about key signs that you may need more protein, even if you think your intake is enough, is supported by multiple authoritative sources from major health outlets.

These include:

1. Healthline - This medically reviewed article lists several symptoms of protein deficiency such as edema (swelling), hair loss, increased hunger, and immune issues. It explains that protein deficiency affects many body functions and even marginal deficiency causes symptoms. Edema, linked to low albumin protein, is highlighted as a sign of severe deficiency but can indicate low protein intake in some cases. (Trust Score 9/10)

https://www.healthline.com/nutrition/protein-deficiency-symptoms

2. Cleveland Clinic Health Essentials - Their article identifies common symptoms such as muscle loss, swelling (edema), weak immune system, stunted growth, and hair loss as signs of protein deficiency. It also notes that swelling may occur due to a lack of albumin and emphasizes multiple symptoms often appear together. (Trust Score 9/10)

https://health.clevelandclinic.org/protein-deficiency-symptoms

3. Continental Hospitals blog - They highlight symptoms including fatigue, muscle loss, weak immunity, hair loss, swelling (edema), and increased appetite/cravings as signs of protein deficiency. The explanation of how protein affects immune function and fluid balance aligns with other expert sources. (Trust Score 6/10)

https://continentalhospitals.com/blog/top-10-signs-you-might-be-protein-deficient/

4. UCLA Health - Their article covers protein deficiency symptoms such as brittle hair and nails, weakness, frequent illness, mood changes, and muscle weakness. It stresses that the minimum protein intake may not be enough as people age, and deficiency signs often develop gradually. (Trust Score 8/10)

https://www.uclahealth.org/news/article/are-you-getting-enough-protein-heres-what-happens-if-you-dont

Overall, these reputable sources confirm that multiple signs like swelling, hair or muscle loss, fatigue, increased hunger, and immune problems can indicate inadequate protein intake, supporting the authenticity of the original content.