Losing weight for a date: questions to ask yourself before you start

A date like a holiday or a wedding is a good reason to start and a poor deadline. The six questions below help you work out what will realistically change by then, what you will not do to get there, and who should see a doctor first.

What should be different on that day

Answer without a number on the scale. "I want to feel at ease on the beach", "I want the dress to sit looser", "I want to arrive at the wedding with energy" are three different goals. The first is largely about how you relate to your body, the second depends on the cut of the dress, and the third rests almost entirely on sleep and routine, with weight playing a minor part.

If the answer is "I want to like myself", it helps to ask what stops you liking yourself today. Weight may be part of the answer, but rarely the only part.

Is that enough time for weight to change

What happens to your weight in a week is covered in Can you lose weight in a week?, and the pace that studies describe is in the article on the rate of weight loss. For a span of a few weeks, weight is an unreliable measure of success, so it is better to measure something else.

Pick what you can change in that time and check: sleep, portion sizes, vegetables in two meals out of three, a daily walk, the habit of writing food down. And name separately what the date cannot change: your height, your build, how a particular garment fits.

What will you do after the date

This is the hardest question and the most important one. A review by Kevin Hall and Scott Kahan of the US National Institutes of Health cites a meta-analysis of 29 long-term weight-loss studies: more than half of the lost weight came back within two years, and more than 80% by year five. The authors link this to the body's physiological response to weight loss (energy expenditure falls, appetite rises) and to the fact that keeping weight off takes ongoing effort (Hall and Kahan, 2018). This is the average across programmes, not a verdict on any one person.

The same review notes that outside motivation, such as cultural norms for thinness or directives from others, can move weight in the short run but rarely produces lasting determination. So ask in advance: on the day after the date, will I carry on as I am, move to something gentler, or go back to how I ate before? If it is the last one, nothing in the plan holds the result in place. More on keeping weight steady: maintaining weight loss.

What you will not do under any circumstances

Decide this now, while the date is far away, not in the last week when the deadline presses. Write down your limits:

• I will not eat very little or fast to meet a deadline;
• I will not use laxatives or diuretics, make myself sick, or dehydrate myself for a quick effect;
• I will not push exercise past what I normally do, through pain and exhaustion;
• I will not skip social events or trips because of food.

The UK's NHS lists making yourself sick or taking laxatives after eating, eating very little food, exercising too much, very strict habits or routines around food, and avoiding socialising when food will be involved among the signs of an eating disorder (NHS, Eating disorders, as of 5 October 2026). A line drawn beforehand protects you from a decision that looks reasonable only under deadline pressure.

Do you need a doctor first

If any of these apply, start with an appointment, not a diet:

• pregnancy or breastfeeding. For pregnant women with obesity the NHS says plainly not to try to lose weight during pregnancy: it will not reduce the chance of complications and may not be safe (NHS, Obesity and pregnancy);
• diabetes, especially if you take insulin or other glucose-lowering medicines. According to the NHS, low blood sugar affects people with diabetes who take insulin or some other diabetes medicines, and the risk rises if you miss or delay meals or do not eat enough carbohydrate (NHS, Low blood sugar). Changes to your diet and doses belong with your doctor;
• regular medication, or a chronic condition of the kidneys, liver, heart or gut;
• an eating disorder now or in the past;
• being under 18: decisions about a teenager's weight are made by a doctor together with the family.

Start with a GP or endocrinologist, and for the diet itself see a registered dietitian. How a dietitian differs from a nutritionist is covered in Nutritionist vs dietitian.

What is your fallback

If it does not work out by the date, then what? The "I'll go as I am" option deserves as much thought as the main plan. It decides how a miss ends: with an adjusted plan, or with "it didn't work anyway, I'll give up". Hall and Kahan list this chain of thought among the counterproductive ones: "what's the point, I failed again", and overeating in response to gaining a few pounds. How to keep one slip from becoming a lost month: diet slip-ups.

When it is no longer about the date

If thoughts about weight and food fill most of your day, if you hide how much you ate, or if you do something after eating to "make up for it", write to a doctor rather than looking for another diet. The NHS notes that an eating disorder can be treated and that most people recover with treatment. This text does not diagnose; it only names signs where a conversation with a specialist matters more than the next plan. The line between a tool and an obsession is in the article on calorie counting and eating disorders.

Count it from a photo

Frequently asked questions

Can I lose weight for a holiday if there is little time left?

Over a short span weight is a poor measure of success. Choose what you can change and check: sleep, portions, vegetables, walking, writing food down. And plan for turning up as you are.

What comes back after the date?

In a meta-analysis of 29 long-term weight-loss studies, more than half of the lost weight returned within two years. That is why the plan for the day after matters more than the plan before the date.

When do I need a doctor before trying to lose weight?

In pregnancy or breastfeeding, with diabetes, regular medication, a chronic condition, a past or present eating disorder, and for teenagers.

What if thoughts about weight take up the whole day?

Write to a doctor: a GP, therapist or psychiatrist. It is not a diagnosis, just a reason to talk to a specialist; with treatment most people with an eating disorder recover.

Read next

• Can you lose weight in a week: what actually changes in seven days — In a week, the scale will almost certainly show a lower number—and almost certainly not because of fat.
• What happens after weight loss and how to maintain the results — Weight loss and weight maintenance are two different tasks, and the latter is more difficult.
• Diet slip-ups: why they happen and how not to turn one day into a week — A diet slip-up refers to an episode where significantly more food is eaten than planned or foods outside the plan are consumed.
• Nutritionist and dietitian: what is the legal difference — The difference between these terms lies not in the depth of knowledge, but in legal status.

This article is for general information. It is not medical advice, a diagnosis, or a prescription for treatment or a diet, and it does not replace a consultation with your doctor. If you have a health condition, are pregnant, take medication, or follow a diet prescribed to you, decisions about food belong with your doctor.

Figures from regulations, guidelines and studies are given as they stood when this article was prepared and may since have changed; check them against the primary sources. This article is not advertising, an offer, or individual advice, and neither the author nor the site owner is responsible for decisions taken on the basis of it.