What is a crash diet? State any two of its harmful effects.

Concept understanding — Balanced Diet Definition

A balanced diet is one of those ideas that sounds technical but is actually something you already understand from everyday life. Think about your phone: if you only ever charge it to 100% but never update its software, it works for a while but eventually slows down or crashes. Your body is similar — it needs a mix of different inputs, not just one thing in large quantity, to function properly over the long run.

At its simplest, a balanced diet means eating the right amounts of different kinds of food so that your body gets all the nutrients it needs to work well. It is not about eating less or following a fad; it is about eating smart. The key word is "balance" — not too much of any one thing, and not too little of another.

The precise meaning is this: a balanced diet provides all the essential nutrients — carbohydrates, proteins, fats, vitamins, minerals, fibre, and water — in proportions that match your body's requirements. These nutrients are not optional extras; each one has a specific job. Carbohydrates give you energy for daily tasks. Proteins help build and repair tissues. Fats support cell function and help absorb certain vitamins. Vitamins and minerals regulate everything from your immune system to your bone strength. Fibre keeps your digestion smooth, and water is involved in nearly every chemical reaction in your body.

Important

A balanced diet is not a fixed menu. It changes with age, gender, activity level, and health condition. What is balanced for a growing teenager is different from what is balanced for an elderly person or a pregnant woman. The principle stays the same — variety and proportion — but the details shift.

Why does this matter for you, even if you are not studying biology or medicine? Because your ability to concentrate, your mood, your energy levels, and even your long-term health are directly tied to what you eat. A student who skips breakfast and lives on tea and biscuits is running on empty by mid-morning — their brain has no fuel. Over months and years, an unbalanced diet can lead to deficiencies (like anaemia from lack of iron) or excesses (like obesity from too much fat and sugar). Both extremes harm your quality of life.

A practical way to visualise a balanced diet is through the idea of food groups. You do not need to memorise exact grams, but you should know the broad categories:

Grains and cereals (rice, wheat, millets) — main source of energy
Pulses, legumes, nuts, and seeds — rich in protein …

Start your 14-day free trial to unlock the full solution →

A crash diet is an extreme, very-low-calorie eating plan followed for rapid weight loss, and its harmful effects include metabolic slowdown, nutrient deficiencies, muscle loss, gallstones, and rebound weight gain.

A crash diet is exactly what it sounds like — a drastic and unscientific reduction in food intake, often below 800–1000 calories per day, with the sole goal of shedding kilograms in the shortest possible time. People turn to it before a wedding, a vacation, or an exam, lured by the promise of quick results. But the body does not treat this as a healthy reset; it treats it as a famine.

When you starve yourself, your body cannot distinguish between a deliberate diet and an actual food shortage. It responds by lowering its basal metabolic rate — the energy it burns just to keep you alive — so that it can conserve fuel. This is the opposite of what you want for lasting weight loss. Worse, once you resume normal eating, the metabolism stays sluggish, and the weight comes back faster than it left, often with extra fat.

Important

Crash diets are not sustainable and are never recommended by health professionals. The weight lost is often water and muscle, not fat, and the long-term damage to metabolism and organ function can be serious.

Two harmful effects of a crash diet:

Loss of lean muscle mass and metabolic slowdown. Because the body is not getting enough protein and energy, it begins to break down its own muscle tissue for fuel. Muscle is metabolically active — it burns calories even at rest. Losing it lowers your resting metabolic rate, making future weight management harder and leaving you weaker and more fatigued. …

Start your 14-day free trial to unlock the full solution →

←Previous questionQ5 — Night blindness, and in prolonged deficiency xerophthalmia, is caused …→Next questionQ5 — Name any three categories of non-nutritive components of diet (other t…

Q.What is a crash diet? State any two of its harmful effects.

🎓Unlock everything free for 14 days

Unlock everything free for 14 days