be on a diet
to only eat certain foods in order to lose weight

[TahlilGaran] Dictionary of Contemporary English ▲

eat to put food in your mouth and chew and swallow it:
Experts recommend eating plenty of fruit and vegetables.
have to eat a particular food:
‘What do you usually have for breakfast?’ ‘I usually just have coffee and toast.’
We had the set meal.
feed on something to eat a particular kind of food – used when talking about animals:
Foxes feed on a wide range of foods including mice, birds, insects, and fruit.
consume written to eat or drink something – used especially in scientific or technical contexts:
Babies consume large amounts relative to their body weight.
munch (on) something to eat something with big continuous movements of your mouth, especially when you are enjoying your food:
He was munching on an apple.
They were sitting on a bench munching their sandwiches.
nibble (on) something to eat something by biting off very small pieces:
If you want a healthy snack, why not just nibble on a carrot?
pick at something to eat only a small amount of your food because you are not hungry or do not like the food:
Lisa was so upset that she could only pick at her food.
stuff/gorge yourself to eat so much food that you cannot eat anything else:
He’s always stuffing himself with cakes.
We gorged ourselves on my mother’s delicious apple tart.
slurp to eat soup, noodles etc with a noisy sucking sound:
In England it’s considered rude to slurp your soup, but in some countries it’s seen as a sign of enjoyment.
gobble something up/down informal to eat something very quickly, especially because you like it very much or you are greedy:
You’ve gobbled up all the ice-cream!
The children gobbled it down in no time.
wolf something down informal to eat food quickly, especially because you are very hungry or in a hurry:
The boy wolfed down everything on his plate and asked for more.
bolt something down British English to eat food very quickly, especially because you are in a hurry:
He bolted down his breakfast and was out of the door within 5 minutes.
You shouldn’t bolt your food down like that.
devour /dɪˈvaʊə $ -ˈvaʊr/ especially written to eat all of something quickly because you are very hungry:
In a very short time, the snake had devoured the whole animal.
be on a diet to be eating less or different food than normal in order to become thinner:
No cake thanks – I’m on a diet.
fast to not eat for a period of time, often for religious reasons:
Muslim people fast during the month of Ramadan.

[TahlilGaran] English Thesaurus ▲

quickly at a high speed or without taking much time:
The stream was flowing quite quickly.
They quickly became friends.
fast at a high speed – used especially when talking about how something moves:
You're driving too fast!
He ran home as fast as he could.
quick spoken quickly – used in exclamations or in comparatives:
Quick! There’s a mouse!
swiftly written quickly:
The government acted swiftly.
She was surprised that he agreed so swiftly.
rapidly quickly – used especially about changes, increases, improvements etc:
The population is growing rapidly.
a rapidly changing world
speedily quickly and therefore efficiently:
All problems were speedily dealt with.
briskly quickly and energetically:
He walked briskly back along the path.
at high/great speed at a very fast speed – used especially in technical descriptions:
The molecules are travelling at great speed.
at a rapid rate especially written quickly – used about changes, increases, improvements etc:
Internet shopping is growing at a rapid rate.
as quick as a flash/in a flash extremely quickly:
As quick as a flash, I was back in my bed and under the covers.
like lightning moving extremely quickly:
Like lightning, the cat darted under the bushes.
flat out especially British English at the fastest speed possible:
The car was going flat out.
He was running flat out.
high-speed [only before noun] designed to travel or operate very quickly:
a high-speed train
high-speed Internet access
rapid especially written happening in a short period of time – used about changes, increases, improvements etc:
a rapid increase in the population
the rapid expansion of the firm’s business in the Middle East
a rapid decline in profits
swift written moving quickly or happening after only a short time:
The horses ran along the track at a swift trot.
He received a swift response to his letter.
brisk quick and energetic:
a brisk walk in the countryside
His manner was very brisk.
speedy [only before noun] happening after only a short time:
Everyone wishes you a speedy recovery.
a speedy resolution to the problem
hurried done more quickly that usual, because you do not have much time:
She ate a hurried breakfast in the cafe before catching her train.
We made a hurried departure.
hasty deciding or doing something very quickly, especially when this has bad results:
It was a hasty decision, which he later regretted.
Let’s not be too hasty.
be on a diet to be eating less or different food than normal in order to become thinner:
No cake thanks – I’m on a diet.

[TahlilGaran] English Thesaurus ▲

on a diet
to be eating less food so that you can lose weight
I was on a diet for several months last year.

I have been on a diet for two months now.

[TahlilGaran] English Idioms Dictionary ▲