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Major supermarkets such as Tesco and Morrisons have seen their market shares eaten away by discounters like Aldi and Lidl as well as cheap deals to eat out at pubs or cafes.
August was the fourth month in a row in which food sales had fallen in both the like-for-like and total measures, according to the British Retail Consortium and KPMG report.
The food sector remains in a state of disruption with the share of the 'big four' being challenged on many fronts after a 15-year reign.
The like-for-like decline shows the battle is being fought via the prices on the shelves, but the war may be won by those grocers best able to adhere to brand values to retain customer loyalty.
Supermarket price wars kept grocers under intense pressure last month, despite the rest of the retail sector growing in August, according to the latest figures released.
The British Retail Consortium and KPMG survey saw like-for-like retail sales lift 1.3% on the back of stronger clothing and footwear last month, with total sales jumping to 2.7%.
However, food sales fell by 1.6% over the quarter, the sharpest decline since November 2009, while like-for-like sales also slipped 3.6% over the last three months.
Marks & Spencer has blamed website "teething problems" as the chain recorded three straight years of quarterly declines.
While food sales grew by 1.7%, the retailers homeware and clothing division registered a 1.5% fall in like-for-like sales - its 12th quarter in a row of declining sales.
Overall, the group's total revenues for the period grew 2.3%.
"We have seen a continued improvement in clothing, although as anticipated the settling in of the new M&S.com site has had an impact on sales," chief executive Marc Bolland said.
Mr Bolland was due to face concerned shareholders at M&S's AGM at Wembley Stadium.
Poundland has announced mega sales figures topping almost £1bn this year, resulting in record profits.
The discount store says it plans to expand by opening 60 extra shops, which will create another 1,000 jobs over the next financial year.
Profits were up by 23.5% to a record £36.8 million, the retailer said, adding that it planned to open stores in Europe - first targeting the Spanish market.
Poundland opened 70 new stores in the UK this year, taking its total number of shops to 528.
The British High Street has "the most competitive food landscape for some time," according to retail mogul Sir Philip Green.
The businessman was under no illusions about how competitive food retail had become in the UK.
There's no point in opening up and getting torn apart because we haven't got competitive prices.
We know what we're going into - the most competitive food landscape for some time.
On the basis that everyone is going into the high street and convenience, maybe it's an opportunity. If you don't buy a ticket, you can't win the lottery.
Billionaire Sir Philip Green will reportedly use BHS to start selling discounted food in a bid to join the supermarket price wars.
The retail mogul told the Sunday Times the branded goods sold at BHS department stores would be around 10% cheaper than those from Tesco, Asda, Sainsbury's and Morrisons.
Sir Philip, who owns a number of the High Street's big names including Topshop, wants to take on cut price food retailers like Aldi and Lidl.
BHS is to see its first two shops to offer food, in Staines and Warrington, within days, - with plans for about 140 such outlets.
The openings will reportedly see sections of stores set aside for branded products such as bread and cakes, frozen items and soft drinks.
KPMG head of retail David McCorquodale says aside from grocers, retailers will feel "heartened" by post Christmas sales figures.
Other than the grocers, retailers will feel heartened by these post-Christmas figures.
The divide between food and non-food is stark, with the battle for market share in food remaining ferocious, customer loyalty fickle and cost deflation being passed through to the consumer.