Consequences of Too Little Protein

1. Muscle Loss & Weakness

When protein intake drops too low, your body enters survival mode—literally cannibalising your own muscle tissue to extract the amino acids it desperately needs. This isn't just about looking less toned; it's a serious functional problem. You'll notice strength declining, everyday tasks becoming harder, and your metabolism slowing down (since muscle burns more calories at rest). For older adults, this becomes even more critical—insufficient protein dramatically increases the risk of falls and fractures, which can be life-altering.

2. Poor Immune Function

Your immune system is built from protein. Antibodies, white blood cells, and immune signalling molecules all require adequate amino acids to function properly. Skip the protein, and you're essentially disarming your body's defence system. The result? You catch colds and infections more easily, and when you do get sick, recovery takes significantly longer. In a world where staying healthy matters, this is a real cost.

3. Slow Wound Healing

Protein is the raw material your body uses to repair damaged tissue. Whether it's a paper cut, a surgical wound, or an injury from exercise, healing requires amino acids. Without enough protein, your body simply can't rebuild tissue efficiently. What should take days can stretch into weeks, leaving you vulnerable to infection and complications.

4. Hair, Skin, and Nail Problems

These visible signs of protein deficiency often appear first. Hair becomes thin and brittle, nails crack and peel, and skin loses its elasticity and glow—looking dull, dry, and prematurely aged. While these might seem cosmetic, they're actually your body's way of signalling that something's wrong internally.

5. Hormonal & Neurotransmitter Disruption

Protein isn't just structural—it's the building block for hormones like insulin and neurotransmitters like serotonin and dopamine. When protein is scarce, hormone production suffers, leading to mood swings, persistent fatigue, brain fog, and difficulty concentrating. You might feel unmotivated or depressed without realising the root cause is nutritional.

6. Swelling (Oedema) in Severe Deficiency

In extreme cases of protein deficiency, blood albumin levels drop so low that fluid leaks from your bloodstream into surrounding tissues, causing visible swelling in the legs, feet, and abdomen. This is a sign of serious malnutrition and requires immediate attention.

How Much Protein Is "Just Right"?

General Guidelines

• 0.8 g per kg of body weight — the bare minimum for sedentary adults
• 1.0–1.2 g/kg — ideal for moderately active adults
• 1.2–1.6 g/kg — recommended for strength training, fat loss, or older adults
• Above 2.0 g/kg — rarely necessary unless you're under professional guidance

Real-World Example

If you weigh 80 kg:

• Minimum intake: approximately 64 g per day
• Optimal intake (if active): 95–125 g per day

The key is matching your protein intake to your activity level and life stage. Getting enough protein isn't just about building muscle—it's about maintaining your health, immunity, appearance, and mental clarity.