Band 8.5 model answer: advantages and disadvantages

A band 8.5 model answer to a real IELTS Writing Task 2 question, with the paragraph plan that fits it. Aim for 250 to 290 words in 40 minutes.

The question

In many countries, personal food choices are increasingly influenced by genetic testing and health-tracking apps that recommend specific diets. What are the advantages and disadvantages of relying on technology to make dietary decisions?

Your 4-paragraph plan

Introduction (40-50 words). Paraphrase the topic and say whether the benefits outweigh the drawbacks.
Body paragraph 1 (80-100 words). The strongest advantage, developed with a concrete example.
Body paragraph 2 (80-100 words). The main disadvantage, developed honestly, then weighed against the advantage.
Conclusion (40-50 words). State your overall judgement: which side wins and why.

The trap in this question type

The question usually asks whether the advantages OUTWEIGH the disadvantages. Answer that comparison directly, not just a list of each.

Band 8.5 model answer

358 words, the length a strong candidate produces in the 40 minutes Task 2 allows (the minimum is 250). Written for this exact question in the official format. Read it once for ideas, then write your own before comparing.

Handing dietary decisions over to a genetic test or a smartphone app rather than to habit, culture or a doctor's general advice is now common practice, particularly among younger urban professionals, and this shift brings real benefits alongside some less obvious costs. The clearest advantage is precision. A DNA kit that flags lactose intolerance or a predisposition to high cholesterol can steer someone away from decades of guesswork, and an app that logs blood glucose after every meal can show a prediabetic office worker in Singapore, for instance, exactly which foods spike his sugar and which do not. This kind of individualised feedback is something a generic food pyramid or a five-minute consultation with an overworked GP simply cannot provide, and it allows people to catch problems before they become chronic illnesses requiring expensive treatment. The disadvantages, however, are equally substantial, and the most serious of them is that these tools can be wrong in ways users have no means of detecting. An algorithm trained on population averages may recommend a high-protein diet to someone with undiagnosed kidney strain, and because the underlying reasoning is rarely disclosed, the user has no way to judge when the advice is unsuitable to his own body. Compounding this is a quieter problem of incentive: many of these platforms are owned by supplement or meal-kit companies, so an app that diagnoses a protein deficiency will, unsurprisingly, recommend its own branded protein powder rather than a cheaper dietary adjustment. The two problems reinforce each other, since a user has no independent check on either the accuracy of the diagnosis or the motive behind the remedy. On balance, technology is best treated as a diagnostic aid rather than a final authority. Genetic data and tracking apps can narrow down possibilities and reveal patterns invisible to the naked eye, but the interpretation of that data still benefits from a dietitian who can weigh context, mental health and lifestyle in ways no algorithm fully captures. Used this way, as a starting point for conversation with a professional rather than a replacement for one, the technology adds real value without exposing users to its more serious risks.

Why this answer earns band 8.5

The hedged claim 'this shift brings real benefits alongside some less obvious costs' commits to a genuinely balanced Task Response from the first sentence, whereas a band 6.5 answer would default to a flat assertion like 'apps are very useful for health' and never complicate it.
The cohesive pivot 'The disadvantages, however, are equally substantial' explicitly signals that the second half is given the same weight as the first, which matters because a weaker script often opens its drawback paragraph with a bare 'Secondly' and no evaluative link back to the advantages already given.
Body 2 develops only two disadvantages (algorithmic misjudgement and commercial bias) rather than three, and the sentence 'The two problems reinforce each other' ties them together so the paragraph still matches the depth of the single-point Body 1, which is preferable to listing three thin points in the same space.
The phrase 'a prediabetic office worker in Singapore' and the claim about apps 'owned by supplement or meal-kit companies' are invented but plausible details used to ground abstract arguments, a technique that is safe in Task 2 as long as no specific institution, statistic or study is fabricated.
The closing move 'best treated as a diagnostic aid rather than a final authority' adds a personal recommendation beyond the set question, which is acceptable here because the advantages and disadvantages have already been given equal, complete treatment first, so the stance reads as a synthesis rather than a dodge.

The plan, reusable on any question of this type

Introduction: paraphrase the shift from habit/doctor advice to genetic tests and apps, and signal that both sides carry weight (~42 words)
Body 1: the single advantage of individualised precision, illustrated through a glucose-tracking example contrasted with generic dietary advice (~93 words)
Body 2: two linked disadvantages - algorithmic misjudgement from population-level data and commercial bias from app ownership - shown to compound one another (~135 words)
Conclusion: recommend treating the technology as a diagnostic aid that still needs professional interpretation, not a standalone authority (~88 words)

Phrases worth learning

this shift brings real benefits alongside some less obvious costs	to introduce a balanced two-sided essay on any technology-and-society topic
is something a generic... simply cannot provide	to argue that a specific tool or method offers an advantage no alternative matches
The disadvantages, however, are equally substantial	as a clear paragraph-opening pivot from benefits to drawbacks
the two problems reinforce each other	to link two separate drawbacks into a single compounding argument instead of listing them separately
best treated as a... rather than a final authority	to recommend cautious, limited reliance on any tool or source in a conclusion

This answer includes invented specific detail written to show how detail is used, not to be quoted as fact: a prediabetic office worker in Singapore; and the claim that many such platforms are owned by supplement or meal-kit companies that recommend their own branded protein powder. IELTS does not check facts, so this is about the texture, never the claim.