As cold weather sweeps across the country, Public Health England is urging people to look out for others, to keep warm indoors and to take care when out and about. With parts of Cambridgeshire likely to experience severe cold weather and icy conditions over the next few days, a Level 3 Cold Weather Alert has been triggered in the county until Saturday. The Met Office has forecast temperatures just below freezing today and tomorrow and a Yellow warning of snow and ice has been issued. Val Thomas, consultant in public health at Cambridgeshire County Council, said: Although winter weather and snow can be fun for some, these weather conditions are also associated with an increase in illness and injuries. Cold weather increases the risk of heart attacks, strokes, lung illnesses, flu and other diseases and people slip and fall in the snow or ice, sometimes suffering serious injuries. Some groups, such as older people, very young children, and people with serious medical conditions are particularly vulnerable to the effects of cold weather. Wear a few layers of thin clothing rather than one thick layer when out and about, and when you need to go outside wear shoes with slip resistant, good grip soles. If indoors, keep your heating to the right temperature as heating your home to at least 18°C in winter poses minimal risk to your health when you are wearing suitable clothing. We also are asking everyone to remember the needs of friends, relatives and neighbours who could be at risk during this period of severe cold weather. Make sure they know what to do to stay warm and are well stocked with food and medications. If you, or they, are eligible for a flu vaccination make sure you get it as soon as you can. The Stay Well This Winter campaign can help you and your family prepare for winter. For more information, visit nhs.uk/staywell. Follow #winterready and #weatheraware on Twitter for winter health advice.Top tips to keep warm during cold weather: Keep your home warm, efficiently and safely: * heating your home to at least 18°C in winter poses minimal risk to your health when you are wearing suitable clothing * get your heating system and cooking appliances checked and keep your home well ventilated * use your electric blanket as instructed and get it tested every three years. Never use a hot water bottle with an electric blanket * do not use a gas cooker or oven to heat your home; it is inefficient and there is a risk of carbon monoxide poisoning and this can kill * make sure you have a supply of heating oil or LPG or sold fuel if you are not on mains gas or electricity to make sure you do not run out in winter. Keep in the warmth by: * fitting draught proofing to seal any gaps around windows and doors * making sure you have loft insulation. And if you have cavity walls, make sure they are insulated too * insulate your hot water cylinder and pipes * draw your curtains at dusk to help keep heat generated inside your rooms * make sure your radiators are not obstructed by furniture or curtains Look after yourself: * food is a vital source of energy and helps to keep your body warm so have plenty of hot food and drinks * aim to include five daily portions of fruit and vegetables. Tinned and frozen vegetables count toward your five a day * stock up on tinned and frozen foods so you dont have to go out too much when its cold or icy * exercise is good for you all year round and it can keep you warm in winter * if possible, try to move around at least once an hour. But remember to speak to your GP before starting any exercise plans * wear lots of thin layers clothes made from cotton, wool or fleecy fibres are particularly good and maintain body heat * wear good-fitting slippers with a good grip indoors and shoes with a good grip outside to prevent trips, slips and falls * make sure you have spare medication in case you are unable to go out * Check if you are eligible for inclusion on the priority services register operated by your water and power supplier.